Temporary Equity Disclosure [Abstract] REDEEMABLE NONCONTROLLING INTERESTS Redeemable Noncontrolling Interests [Text Block] Disclosure pertaining to Redeemable Noncontrolling Interests. Accounting Policies [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Noncontrolling Interest Noncontrolling Interest [Member] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Previously Reported Previously Reported [Member] Restatement Adjustment Restatement Adjustment [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Common shares of beneficial interest Common Stock, Value, Issued Noncontrolling interests – consolidated real estate entities Noncontrolling Interest in Operating Partnerships Redeemable noncontrolling interests - consolidated real estate entities Temporary Equity, Carrying Amount, Attributable to Parent Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Schedule of Redeemable Noncontrolling Interest Activity Redeemable Noncontrolling Interest [Table Text Block] Noncontrolling Interest [Abstract] NONCONTROLLING INTERESTS Noncontrolling Interest Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Restricted Stock Units with Service Conditions Restricted Stock Units With Service Conditions [Member] Restricted Stock Units With Service Conditions [Member] Restricted Share Awards Restricted Share Awards [Member] Financial information relating to Restricted Share Awards. Restricted Stock With Market Conditions Restricted Stock With Market Conditions [Member] Restricted Stock With Market Conditions [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units (RSU) Restricted Stock Units (RSUs) [Member] Restricted Stock Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unvested, end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Unvested, beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Unvested, end of period (in dollars per share) Earnings Per Share [Abstract] Reconciliation of Numerator and Denominator Used To Calculate Basic and Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Retirement Benefits [Abstract] RETIREMENT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] BMO Line of Credit B M O Line Of Credit [Member] Represents the credit agreement for the unsecured, variable interest rate BMO Line of Credit. Term Loan Maturing 2024 Term Loan Maturing 2024 [Member] Term Loan Maturing 2024 [Member] Term Loan Maturing 2025 Term Loan Maturing 2025 [Member] Term Loan Maturing 2025 [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Construction Debt Construction Loan Payable [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Mortgages Mortgages [Member] Line of Credit Line of Credit [Member] Unsecured Debt Unsecured Debt [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Multifamily Multifamily [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Domestic Line of Credit Domestic Line of Credit [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Base Rate Base Rate [Member] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Number of apartment communities Number of Real Estate Properties Number of apartment communities, serving as collateral for mortgage loans Number Of Real Estate Properties, Collateral Number Of Real Estate Properties, Collateral Interest rate Debt Instrument, Interest Rate, Effective Percentage Number of loans in default Number of Loans in Default Refers to number of loans in default Number of real estate properties, unencumbered by mortgages Number Of Real Estate Properties, Unencumbered Number Of Real Estate Properties, Unencumbered Number of real estate properties, unencumbered used to provide credit support Number Of Real Estate Properties, Unencumbered, Used To Provide Credit Support Number Of Real Estate Properties, Unencumbered, Used To Provide Credit Support Amount available Line of Credit Facility, Maximum Borrowing Capacity Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Revolving line of credit Long-term Line of Credit Interest rate (in hundredths) Line of Credit Facility, Interest Rate During Period Number of extensions Line Of Credit Facility, Number Of Extensions Line Of Credit Facility, Number Of Extensions Extension term Line Of Credit Facility, Extension Term Line Of Credit Facility, Extension Term Original principal balance Debt Instrument, Face Amount Long-term debt, term Long-term Debt, Term Interest rate spread (as a percent) Debt Instrument, Basis Spread on Variable Rate Term Debt Instrument, Term Carrying principal value Long-term Debt, Gross Weighted average interest rate (in hundredths) Debt, Weighted Average Interest Rate Selected Quarterly Financial Information [Abstract] Revenues Revenues Net income (loss) attributable to controlling interests Net Income (Loss) Attributable to Parent Net income (loss) available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) per common share - basic & diluted (in dollars per share) Earnings Per Share, Basic and Diluted SHARE BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date QUARTERLY RESULTS OF CONSOLIDATED OPERATIONS (unaudited) Quarterly Financial Information [Text Block] Business Combinations [Abstract] Acquisitions Schedule of Business Acquisitions, by Acquisition [Table Text Block] Development Projects Placed in Service Development Projects Placed in Service [Table Text Block] Tabular disclosure of development projects placed in service. Schedule of Dispositions Schedule of Disposal Groups, Including Discontinued Operations, Gain Loss on Disposition [Table Text Block] Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss). Commitments and Contingencies Disclosure [Abstract] Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Southgate - Minot, ND Southgate Minot Nd [Member] Southgate - Minot, ND Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Axis] Property Subject to or Available for Operating Lease [Domain] Property Subject to or Available for Operating Lease [Domain] Subject to Restrictions on Taxable Dispositions Subject To Restrictions On Taxable Dispositions [Member] Refers to a property subject to restrictions on taxable dispositions. Real Estate Properties [Line Items] Real Estate Properties [Line Items] Number of real estate properties Number of apartment homes (approximately) Number of Units in Real Estate Property Real estate investment amount of properties (net of accumulated depreciation) Real Estate Investments, Net Redemption basis Redemption basis The number of limited partners' units to be redeemed in exchange for a number of common shares upon exercise of the redemption option by the limited partners. Number of consecutive trading days for valuation Number of consecutive trading days for valuation The number of consecutive trading days for valuation. Aggregate redemption value of Units of operating partnership owned by limited partners Redemption Value of UPREIT Units The redemption value of UPREIT Units during the period. Number of joint ventures with buy sell options Number of Joint Ventures with Buy Sell Options The number of joint ventures with a buy/sell option compelling the entity to acquire the interest of the other parties over a specified term. Commitment period for joint venture acquisition Commitment Period for Joint Venture Acquisition The commitment period compelling the entity to acquire the interest of the other parties of the joint venture. Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-15 and 2016-18 Accounting Standards Update 2016-15 And Accounting Standards Update 2016-18 [Member] Accounting Standards Update 2016-15 And Accounting Standards Update 2016-18 [Member] Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Net cash provided (used) by operating activities Net Cash Provided by (Used in) Operating Activities Net cash provided (used) by investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided (used) by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash, cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF YEAR Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF YEAR Receivable arising from straight line rents Deferred Rent Receivables, Net Accounts receivable, net of allowance Accounts Receivable, Gross Fair value of interest rate swaps Interest Rate Derivative Assets, at Fair Value Loans receivable Loans Receivable, Net Prepaid and other assets Prepaid Expense and Other Assets Intangible assets Intangible Assets, Net (Excluding Goodwill) Property and equipment, net of accumulated depreciation Property, Plant and Equipment, Net Goodwill Goodwill Deferred charges and leasing costs Deferred Costs, Leasing, Net Total Other Assets Other Assets Cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents Total cash, cash equivalents and restricted cash Segment Reporting [Abstract] OPERATING SEGMENT Segment Reporting Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Real Estate Real Estate [Member] Management Service Management Service [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Multi-Family Residential Multi Family Residential [Member] A classification of real estate where multiple separate housing units for residential inhabitants are contained within one building or several buildings within one complex. All Other Other Segments [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Segment Reporting Information, Profit (Loss) [Abstract] Segment Reporting Information, Profit (Loss) [Abstract] Cost of revenue Cost of Goods and Services Sold Net operating income Income (Loss) from Operations before Extraordinary Items Cost of revenue Casualty loss Real Estate Insurance Depreciation and amortization Depreciation and amortization including related to non real estate investments Depreciation and amortization including related to non real estate investments. Impairment of real estate investments Impairment of Real Estate General and administrative expenses General and Administrative Expense Acquisition and investment related costs Acquisition And Investment Related Costs Acquisition And Investment Related Costs Interest expense Interest Expense Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Interest and other income Interest and Other Income Income (loss) before gain (loss) on sale of real estate and other investments, gain on bargain purchase and income (loss) from discontinued operations Income (loss) before gain (loss) on sale of real estate and other investments and income (loss) from discontinued operations This element represents the income (loss) before the gain (loss) on the sale of real estate and other investments and the income (loss) from discontinued operations. Gain (loss) on sale of real estate and other investments Gain (Loss) on Sale of Properties, before Applicable Income Taxes Gain on bargain purchase Business Combination, Bargain Purchase, Gain Recognized, Amount Income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest NET INCOME (LOSS) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Segment Assets [Abstract] Assets [Abstract] Property owned Real Estate Investment Property, at Cost Less accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Total property owned Real Estate Investment Property, Net Assets held for sale and assets of discontinued operations Real Estate Held-for-sale Cash and cash equivalents Restricted cash Other assets Unimproved land Land Available for Development Mortgage loans receivable Loans Receivable, Commercial, Mortgage, Net of Deferred Costs Loans Receivable, Commercial, Mortgage, Net of Deferred Costs TOTAL ASSETS Assets Schedule of Error Corrections and Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Schedule of Recent Accounting Standards Updates Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule of Other Assets Schedule of Other Assets [Table Text Block] Restrictions on Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Equity [Abstract] Schedule of Conversions of Stock Schedule of Conversions of Stock [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Multi-family Residential Properties Residential Real Estate [Member] Number of apartment homes Fair Value Disclosures [Abstract] Schedule of Fair Value Measurements on a Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of Estimated Fair Values of Financial Instruments Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Depreciation and amortization from discontinued operations Depreciation and Amortization, Discontinued Operations (Gain) loss on sale of real estate, land, other investments and discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax (Gain) loss on extinguishment of debt and discontinued operations Gains (Losses) on Extinguishment Of Debt, Including Discontinued Operations Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity, including discontinued operations. Gain on bargain purchase Share-based compensation expense Share-based Compensation Impairment of real estate investments Impairment of real estate continuing and discontinued operations Impairment of real estate continuing and discontinued operations. Other, net Other Noncash Income (Expense) Write off of development pursuit costs Noncash Project Abandonment Costs Changes in other assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other assets Increase (Decrease) in Other Operating Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided (used) by operating activities CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Principal proceeds on mortgage loan receivable Proceeds from Collection of Loans Receivable Increase in loans receivable Payments to Acquire Loans Receivable Decrease in other investments Payments for (Proceeds from) Other Investing Activities Proceeds from sale of discontinued operations Proceeds from Sale of Real Estate Proceeds from sale of real estate and other investments Proceeds from sale of real estate and other investments Cash received for the sale of real estate that is not part of an investing activity during the current period and the cash inflow associated with the sale of other investments not otherwise defined in the taxonomy. Insurance proceeds received Proceeds from Insurance Settlement, Investing Activities Payments for acquisitions of real estate assets Payments to Acquire Real Estate Payments for development of real estate assets Payments for Construction in Process Payments for improvements of real estate assets Payments for Capital Improvements Payments for improvements of real estate assets from discontinued operations Payments For Capital Improvements Discontinued Operations Payments For Capital Improvements Discontinued Operations Net cash provided (used) by investing activities CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from mortgages payable Proceeds from Issuance of Long-term Debt Principal payments on mortgages payable Repayments of Long-term Debt Proceeds from revolving lines of credit Proceeds from Lines of Credit Principal payments on revolving lines of credit Repayments of Lines of Credit Proceeds from notes payable and other debt Proceeds from Notes Payable Principal payments on notes payable and other debt Repayments of Notes Payable Payoff of financing liability Repayments of Construction Loans Payable Proceeds from term loan Proceeds from Issuance of Unsecured Debt Proceeds from sale of common shares under distribution reinvestment and share purchase program Proceeds from Stock Plans Additions to notes receivable from noncontrolling partner – consolidated real estate entities Additions To Notes Receivable From Noncontrolling Partner Additions To Notes Receivable From Noncontrolling Partner Proceeds from noncontrolling partner – consolidated real estate entities Proceeds from Noncontrolling Interests Payments for acquisition of noncontrolling interests – consolidated real estate entities Payments to Acquire Additional Interest in Subsidiaries Proceeds from sale of preferred shares Proceeds from Issuance of Preferred Stock and Preference Stock Repurchase of common shares Payments for Repurchase of Common Stock Repurchase of preferred shares Payments for Repurchase of Preferred Stock and Preference Stock Repurchase of partnership units Payments for Repurchase of Redeemable Noncontrolling Interest Distributions paid to common shareholders Payments of Ordinary Dividends, Common Stock Distributions paid to preferred shareholders Payments of Ordinary Dividends, Preferred Stock and Preference Stock Distributions paid to noncontrolling interests – Unitholders of the Operating Partnership Payments of Distributions to Affiliates Distributions paid to noncontrolling interests – consolidated real estate entities Payments of Ordinary Dividends, Noncontrolling Interest Net cash provided (used) by financing activities NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES Supplemental Cash Flow Information [Abstract] Distribution reinvestment plan – shares issued Distribution Reinvestment Plan The fair value of stock (or units) issued in noncash financing activities related to the entity's distribution reinvestment plan. Operating partnership distribution reinvestment plan – shares issued Operating partnership distribution reinvestment plan - shares issued The fair value of stock (or units) issued in noncash financing activities related to the entity's operating partnership distribution reinvestment plan. Operating partnership units converted to shares Operating partnership units converted to shares The dollar value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Real estate assets acquired through the issuance of operating partnership units Assets Acquired Through The Issuance Of Operating Partnership Units Assets acquired through issuance of operating partnership units (Decrease) increase to accounts payable included within real estate investments Adjustments to accounts payable included within real estate investments The dollar amount of assets that an Entity acquires in a noncash (or part noncash) acquisition that are not presented as a separate disclosure or not otherwise listed in the existing taxonomy. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. Conversion to equity of notes receivable from noncontrolling interests – consolidated real estate entities Noncash or Part Noncash Acquisition, Debt Assumed Construction debt reclassified to mortgages payable Transfer Mortgage Payable Increase in mortgage notes receivable Mortgage Loan Related to Property Sales Decrease in real estate assets in connection with transfer of real estate assets in settlement of debt Decrease In Real Estate Assets In Connection With Transfer Of Real Estate Assets In Settlement Of Debt Represents the decrease in real estate assets in connection with transfer of real estate assets in settlement of debt. Decrease in debt in connection with transfer of real estate assets in settlement of debt Decrease In Debt In Connection With Transfer Of Real Estate Assets In Settlement Of Debt Represents the decrease in debt in connection with transfer of real estate assets in settlement of debt. SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Supplemental Disclosure of Cash Flow Information [Abstract] Cash paid for interest, net of amounts capitalized of $0, $0, $431 and $4,396, respectively Interest Paid, Excluding Capitalized Interest, Operating Activities Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Major Property Class [Axis] Major Property Class [Axis] Major Property Class [Domain] Major Property Class [Domain] Acquisitions Acquisitions [Member] Properties acquired. 191 homes - Oxbo - St Paul, MN Oxbo St Paul M N [Member] Refers to Oxbo - St Paul, MN, 191 units. 500 homes - Park Place - Plymouth, MN Park Place Plymouth M N [Member] Refers to Park Place - Plymouth, MN. 274 homes - Dylan - Denver, CO Dylan Denver Co [Member] Dylan Denver Co [Member] 390 homes - Westend - Denver, CO Westend - Denver CO [Member] Westend - Denver CO [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Acquisitions and development projects placed in service [Abstract] Acquisitions and development projects placed in service [Abstract] Total acquisition costs Business Combination, Consideration Transferred Form of consideration, cash Payments to Acquire Businesses, Gross Investment allocation, land Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land Investment allocation, building Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings Investment allocation, intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Number of apartment units Area of real estate property Area of Real Estate Property Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Management Management [Member] Director Director [Member] 2015 Incentive Plan Incentive Plan 2015 [Member] Financial information relating to the 2015 stock based compensation plan, long term incentive plan. Long Term Incentive Plan Long Term Incentive Plan2012 [Member] The long term incentive plan for stock based compensation approved in 2012. Trustee Awards Trustee Awards [Member] The financial information relating to stock based compensation awards for each trustee. Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Award In 2019 Award In 2019 [Member] Award In 2019 [Member] Award In 2019 Vesting Two Award In 2019 Vesting Two [Member] Award In 2019 Vesting Two [Member] Award Vesting In 2019 Three Award Vesting In 2019 Three [Member] Award Vesting In 2019 Three [Member] Award In 2019 Vesting One Award In 2019 Vesting One [Member] Award In 2019 Vesting One [Member] 2018 LTIP Awards Award In 2018 [Member] Equity-based compensation granted in 2018. Performance Shares Performance Shares [Member] Unrestricted Stock Stock Compensation Plan [Member] Relative Total Shareholder Return Performance Shares Relative Total Shareholder Return Performance Shares [Member] Shares or units awarded to employees for meeting the performance metric of relative total shareholder return ("TSR"). Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Vesting Periods One Share-based Compensation Award, Tranche One [Member] Vesting Periods Two Share-based Compensation Award, Tranche Two [Member] Vesting Periods Three Share-based Compensation Award, Tranche Three [Member] Number of shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Term of award Share-based Compensation Arrangement by Share-based Payment Award, Term of Award Term of award in which the equity-based award remains in effect, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Stock based compensation expense Allocated Share-based Compensation Expense Restricted shares vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Eligible to be earned (in shares) Percent of RSUs granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Percentage Of Restricted Stock Units Awarded Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Percentage Of Restricted Stock Units Awarded Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Volatility rate (in hundredths) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share price (in dollars per share) Share Price Awards vested during period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Total compensation cost related to non-vested share awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period to recognize cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Share based awards with market conditions, grant date fair value [Abstract] Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted, Aggregate Grant Date Fair Value [Abstract] N/A Grant date fair value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Aggregate Grant Date Fair Value Aggregate grant date fair value of equity-based compensation awards granted during period. Excludes stock and unit options. Share based awards with market conditions, unamortized value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Unamortized value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value, Granted Intrinsic value of equity-based compensation awards granted. Excludes stock and unit options. Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock Series A Preferred Stock [Member] Series B Preferred Stock Series B Preferred Stock [Member] Series C Preferred Stock Series C Preferred Stock [Member] Preferred Shares Preferred Stock [Member] Accumulated Distributions In Excess of Net Income Retained Earnings [Member] Accumulated Other Comprehensive Income Comprehensive Income [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Balance (in shares) Shares, Issued Cumulative adjustment upon adoption of ASC 606 and ASC 610-20 Cumulative Effect of New Accounting Principle in Period of Adoption Balance, adjusted Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance Net income (loss) attributable to controlling interest and noncontrolling interests Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Other comprehensive income - derivative instrument Other Comprehensive Income (Loss), Net of Tax Distributions – common shares and Units Dividends, Common Stock Distributions - preferred shares Dividends, Preferred Stock Distribution reinvestment and share purchase plan (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan Distribution reinvestment and share purchase plan Stock Issued During Period, Value, Dividend Reinvestment Plan Shares issued and share-based compensation (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Shares issued and share-based compensation Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of Series C preferred shares Stock Issued During Period, Value, Preferred Stock, New Issues Equity impact of the value of new preferred stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Partnership units issued Partnership Units Issued The value of partnership units issued during the period. Redemption of units for common shares (in shares) Partners' Capital Account, Units, Redeemed Redemption of Units for common shares Partners' Capital Account, Redemptions Redemption of units for cash Partners Capital Account Cash Redemptions Total change in each class of partners' capital accounts during the year due to redemptions for cash. All partners include general, limited and preferred partners. Shares repurchased (in shares) Stock Repurchased During Period, Shares Shares repurchased Stock Repurchased During Period, Value Contributions from nonredeemable noncontrolling interests – consolidated real estate entities Noncontrolling Interest, Increase from Subsidiary Equity Issuance Distributions to nonredeemable noncontrolling interests – consolidated real estate entities Noncontrolling Interest, Decrease from Distributions to Consolidated Real Estate Entities Noncontrolling Interest Holders Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the consolidated real estate entities noncontrolling interest holders. Conversion to equity of notes receivable from nonredeemable noncontrolling interests – consolidated real estate entities Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Acquisition of nonredeemable noncontrolling interests – consolidated real estate entities Noncontrolling Interest, Decrease from Deconsolidation Other (in shares) Stockholders' Equity, Other Shares Other Stockholders' Equity, Other Adjustments to prior year redemption of Units for common shares Partners' Capital Account, Redemptions, Prior Period Adjustment Total change in each class of partners' capital accounts during the year due to prior period adjustments of redemptions and adjustments to redemption value. All partners include general, limited and preferred partners. Balance Balance (in shares) Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Medium-term Notes Medium-term Notes [Member] Fixed Rate Mortgages Payable Fixed Rate Mortgages Payable [Member] Fixed Rate Mortgages Payable [Member] Variable Rate Mortgages Payable Variable Rate Mortgages Payable [Member] Variable Rate Mortgages Payable [Member] Construction Loans Construction Loans [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Weighted average maturity in years Debt Instrument, Weighted Average Maturity Debt Instrument, Weighted Average Maturity Weighted average interest rate Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Measurement Input, Cap Rate Measurement Input, Cap Rate [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement[Domain] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value Measurements on a Nonrecurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract] Real estate investments valued at fair value iret Real Estate Investment Fair Value Disclosure This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include investments in land and buildings, excluding real estate considered to be inventory of the entity. Real estate held for sale Real estate held for sale This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. Capitalization rate (as a percent) Other Real Estate Owned, Measurement Input FINANCIAL ASSETS Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Mortgage and note receivables Receivables, Fair Value Disclosure FINANCIAL LIABILITIES Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Other debt, including other debt related to assets held for sale Debt Instrument, Fair Value Disclosure Revolving line of credit Lines of Credit, Fair Value Disclosure Term loan Loans Payable, Fair Value Disclosure Mortgages payable Long-term Debt Mortgages payable related to assets held for sale Mortgages Payable Related To Assets Held For Sale Fair Value Disclosure Fair value portion of mortgages payable related to assets held for sale. Schedule of Aggregate Amount of Required Future Principal Payments on Mortgages Payable Schedule of Maturities of Long-term Debt [Table Text Block] Summary of Indebtedness Schedule of Long-term Debt Instruments [Table Text Block] Redeemable Noncontrolling Interest, by Legal Entity [Table] Redeemable Noncontrolling Interest, by Legal Entity [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Redeemable Noncontrolling Interest [Line Items] Redeemable Noncontrolling Interest [Line Items] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Balance at beginning of fiscal year Contributions Net (loss) income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Balance at close of fiscal year SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table] Other - Mixed Use Other Mixed Use [Member] Other Mixed Use [Member] Other - Commercial Other Commercial [Member] Other Commercial [Member] Subtotal Subtotal Of Multi Family And Commercial [Member] Subtotal Of Multi Family And Commercial [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Unimproved Land Unimproved Land [Member] A business segment for reporting the information separately. Wholly Owned Properties Wholly Owned Properties [Member] Development in Progress Development In Progress [Member] Land and building development in progress. 71 France - Edina, MN Seven1 France Edina M N [Member] 71 France - Edina, MN for development, expansion and renovation projects underway or recently completed. Alps Park - Rapid City, SD Alps Park Rapid City Sd [Member] Alps Park - Rapid City, SD for development, expansion and renovation projects underway or recently completed. Arbors - S Sioux City, NE Arbors S Sioux City Ne [Member] Arbors - S Sioux City, NE for development, expansion and renovation projects underway or recently completed. Arcata - Golden Valley, MN Arcata Golden Valley Mn [Member] Arcata - Golden Valley, MN ND for development, expansion and renovation projects underway or recently completed. Ashland - Grand Forks, ND Ashland Grand Forks Nd [Member] Ashland - Grand Forks, ND property acquired or disposed. Avalon Cove - Rochester, MN Avalon Cove Rochester Mn [Member] Avalon Cove - Rochester, MN for development, expansion and renovation projects underway or recently completed. Boulder Court - Eagan, MN Boulder Court Eagan Mn [Member] Boulder Court - Eagan, MN for development, expansion and renovation projects underway or recently completed. Brookfield Village - Topeka, KS Brookfield Village Topeka Ks [Member] Brookfield Village - Topeka, KS for development, expansion and renovation projects underway or recently completed. Canyon Lake - Rapid City, SD Canyon Lake Rapid City Sd [Member] Canyon Lake - Rapid City, SD for development, expansion and renovation projects underway or recently completed. Cardinal Point - Grand Forks, ND Cardinal Point Grand Forks Nd [Member] Cardinal Point - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. Cascade Shores - Rochester, MN Cascade Shores Rochester Mn [Member] Cascade Shores - Rochester, MN for development, expansion and renovation projects underway or recently completed. Castlerock - Billings, MT Castlerock Billings Mt [Member] Castlerock - Billings, MT for development, expansion and renovation projects underway or recently completed. Chateau - Minot, ND Chateau Minot Nd [Member] Chateau - Minot, ND for development, expansion and renovation projects underway or recently completed. Cimarron Hills - Omaha, NE Cimarron Hills Omaha Ne [Member] Cimarron Hills - Omaha, NE for development, expansion and renovation projects underway or recently completed. Colonial Villa - Burnsville, MN Colonial Villa Burnsville Mn [Member] Colonial Villa - Burnsville, MN for development, expansion and renovation projects underway or recently completed. Colony - Lincoln, NE Colony Lincoln Ne [Member] Colony - Lincoln, NE for development, expansion and renovation projects underway or recently completed. Commons at Southgate - Minot, ND Commons At Southgate Minot N D [Member] Commons at Southgate - Minot, ND for development, expansion and renovation projects underway or recently completed. Cottage West Twin Homes - Sioux Falls, SD Cottage West Twin Homes Sioux Falls Sd [Member] Cottage West Twin Homes - Sioux Falls, SD property acquired or disposed. Cottonwood - Bismarck, ND Cottonwood Bismarck Nd [Member] Cottonwood - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Country Meadows - Billings, MT Country Meadows Billings Mt [Member] Country Meadows - Billings, MT for development, expansion and renovation projects underway or recently completed. Crestview - Bismarck, ND Crestview Bismarck Nd [Member] Crestview - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Crown Colony - Topeka, KS Crown Colony Topeka Ks [Member] Crown Colony - Topeka, KS for development, expansion and renovation projects underway or recently completed. Crystal Bay - Rochester, MN Crystal Bay Rochester Mn [Member] Crystal Bay - Rochester, MN for development, expansion and renovation projects underway or recently completed. Cypress Court - St. Cloud, MN Cypress Court St Cloud Mn [Member] Cypress Court - St. Cloud, MN for development, expansion and renovation projects underway or recently completed. Deer Ridge - Jamestown, ND Deer Ridge Jamestown Nd [Member] 'Deer Ridge - Jamestown, ND Dylan - Denver Co Evergreen - Isanti, MN Evergreen Isanti Mn [Member] Evergreen - Isanti, MN for development, expansion and renovation projects underway or recently completed. Forest Park - Grand Forks, ND Forest Park Grand Forks Nd [Member] Forest Park - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. French Creek - Rochester, MN French Creek Rochester Mn [Member] French Creek - Rochester, MN for development, expansion and renovation projects underway or recently completed. Gables Townhomes - Sioux Falls, SD Gables Townhomes Sioux Falls Sd [Member] Gables Townhomes - Sioux Falls, SD property acquired or disposed. Gardens - Grand Forks, ND Gardens Grand Forks N D [Member] Gardens - Grand Forks, ND property acquired or disposed. Grand Gateway - St. Cloud, MN Grand Gateway St Cloud Mn [Member] Grand Gateway - St. Cloud MN property acquired or disposed. GrandeVille at Cascade Lake - Rochester, MN Grandeville At Cascade Lake Rochester Mn [Member] GrandeVille at Cascade Lake - Rochester, MN for development, expansion and renovation projects underway or recently completed. Greenfield - Omaha, NE Greenfield Omaha Ne [Member] Greenfield - Omaha, NE for development, expansion and renovation projects underway or recently completed. Heritage Manor - Rochester, MN Heritage Manor Rochester Mn [Member] Heritage Manor - Rochester, MN for development, expansion and renovation projects underway or recently completed. Homestead Garden - Rapid City, SD Homestead Garden Rapid City Sd [Member] Homestead Garden - Rapid City, SD Indian Hills - Sioux City, IA Indian Hills Sioux City Ia [Member] Indian Hills - Sioux City, IA for development, expansion and renovation projects underway or recently completed. Kirkwood Manor - Bismarck, ND Kirkwood Manor Bismarck Nd [Member] Kirkwood Manor - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Lakeside Village Lincoln, NE Lakeside Village Lincoln Ne [Member] Lakeside Village - Lincoln, NE for development, expansion and renovation projects underway or recently completed. Landmark - Grand Forks, ND Landmark Grand Forks Nd [Member] Landmark - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. Legacy - Grand Forks, ND Legacy Grand Forks Nd [Member] Legacy - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. Legacy Heights - Bismarck, ND Legacy Heights Bismarck N D [Member] Legacy Heights - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Mariposa - Topeka, KS Mariposa Topeka Ks [Member] Mariposa - Topeka, KS for development, expansion and renovation projects underway or recently completed. Meadows - Jamestown, ND Meadows Jamestown Nd [Member] The Meadows - Jamestown, ND for development, expansion and renovation projects underway or recently completed. Monticello Crossings - Monticello, MN Monticello Crossings Monticello Mn [Member] Monticello Crossings - Monticello, MN for development, expansion and renovation projects underway or recently completed. Monticello Village - Monticello, MN Monticello Village Monticello Mn [Member] Monticello Village - Monticello, MN for development, expansion and renovation projects underway or recently completed. North Pointe - Bismarck, ND North Pointe Bismarck Nd [Member] North Pointe - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Northridge - Bismarck, ND Northridge Bismarck N D [Member] Northridge - Bismarck, ND Oakmont Estates - Sioux Falls, SD Oakmont Estates Sioux Falls Sd [Member] Oakmont Estates - Sioux Falls, SD for development, expansion and renovation projects underway or recently completed. Oakwood Estates - Sioux Falls, SD Oakwood Estates Sioux Falls Sd [Member] Oakwood Estates - Sioux Falls, SD for development, expansion and renovation projects underway or recently completed. Olympic Village - Billings, MT Olympic Village Billings Mt [Member] Olympic Village - Billings, MT for development, expansion and renovation projects underway or recently completed. Olympik Village - Rochester, MN Olympik Village Rochester Mn [Member] Olympik Village - Rochester, MN for development, expansion and renovation projects underway or recently completed. Oxbo - St Paul, MN Oxbow Park - Sioux Falls, SD Oxbow Park Sioux Falls Sd [Member] Oxbow Park - Sioux Falls, SD for development, expansion and renovation projects underway or recently completed. Park Meadows - Waite Park, MN Park Meadows Waite Park Mn [Member] Park Meadows - Waite Park, MN for development, expansion and renovation projects underway or recently completed. Park Place - Plymouth, MN Pebble Springs - Bismarck, ND Pebble Springs Bismarck Nd [Member] Pebble Springs - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Pinehurst - Billings, MT Pinehurst Billings Mt [Member] Pinehurst - Billings, MT for development, expansion and renovation projects underway or recently completed. Plaza - Minot, ND Plaza Minot Nd [Member] Plaza - Minot, ND for development, expansion and renovation projects underway or recently completed. Pointe West - Rapid City, SD Pointe West Rapid City Sd [Member] Pointe West - Rapid City, SD for development, expansion and renovation projects underway or recently completed. Ponds at Heritage Place - Sartell, MN Ponds At Heritage Place Sartell Mn [Member] Ponds at Heritage Place - Sartell, MN for development, expansion and renovation projects underway or recently completed. Prairie Winds - Sioux Falls, SD Prairie Winds Sioux Falls Sd [Member] Prairie Winds - Sioux Falls, SD for development, expansion and renovation projects underway or recently completed. Quarry Ridge - Rochester, MN Quarry Ridge Rochester Mn [Member] Quarry Ridge - Rochester, MN for development, expansion and renovation projects underway or recently completed. Red 20 - Minneapolis, MN Red20 Minneapolis Mn [Member] RED 20 - Minneapolis, MN for development, expansion and renovation projects underway or recently completed. Regency Park Estates - St. Cloud, MN Regency Park Estates St Cloud Mn [Member] Regency Park Estates - St. Cloud, MN property acquired or disposed. Ridge Oaks - Sioux City, IA Ridge Oaks Sioux City Ia [Member] Ridge Oaks - Sioux City, IA for development, expansion and renovation projects underway or recently completed. Rimrock West - Billings, MT Rimrock West Billings Mt [Member] Rimrock West - Billings, MT for development, expansion and renovation projects underway or recently completed. River Ridge - Bismarck, ND River Ridge Bismarck Nd [Member] River Ridge - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Rocky Meadows - Billings, MT Rocky Meadows Billings Mt [Member] Rocky Meadows - Billings, MT for development, expansion and renovation projects underway or recently completed. Rum River - Isanti, MN Rum River Isanti Mn [Member] Rum River - Isanti, MN for development, expansion and renovation projects underway or recently completed. Sherwood - Topeka, KS Sherwood Topeka Ks [Member] Sherwood - Topeka, KS for development, expansion and renovation projects underway or recently completed. Sierra Vista - Sioux Falls, SD Sierra Vista Sioux Falls Sd [Member] Sierra Vista - Sioux Falls, SD property acquired or disposed. Silver Springs - Rapid City, SD Silver Springs Rapid City Sd [Member] Silver Springs - Rapid City, SD South Pointe - Minot, ND South Pointe Minot Nd [Member] South Pointe - Minot, ND for development, expansion and renovation projects underway or recently completed. Southpoint - Grand Forks, ND Southpoint Grand Forks Nd [Member] Southpoint - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. Southwind - Grand Forks, ND Southwind Grand Forks Nd [Member] Southwind - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. Sunset Trail - Rochester, MN Sunset Trail Rochester Mn [Member] Sunset Trail - Rochester, MN for development, expansion and renovation projects underway or recently completed. Thomasbrook - Lincoln, NE Thomasbrook Lincoln Ne [Member] Thomasbrook - Lincoln, NE for development, expansion and renovation projects underway or recently completed. Valley Park - Grand Forks, ND Valley Park Grand Forks Nd [Member] Valley Park - Grand Forks, ND for development, expansion and renovation projects underway or recently completed. Villa West - Topeka, KS Villa West Topeka Ks [Member] Villa West - Topeka, KS for development, expansion and renovation projects underway or recently completed. Village Green - Rochester, MN Village Green Rochester Mn [Member] Village Green - Rochester, MN for development, expansion and renovation projects underway or recently completed. Westend - Denver CO West Stonehill - Waite Park, MN West Stonehill Waite Park Mn [Member] West Stonehill - Waite Park, MN for development, expansion and renovation projects underway or recently completed. Westwood Park - Bismarck, ND Westwood Park Bismarck Nd [Member] Westwood Park - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Whispering Ridge - Omaha, NE Whispering Ridge Omaha Ne [Member] Whispering Ridge - Omaha, NE for development, expansion and renovation projects underway or recently completed. Winchester - Rochester, MN Winchester Rochester Mn [Member] Winchester - Rochester, MN for development, expansion and renovation projects underway or recently completed. Woodridge - Rochester, MN Woodridge Rochester Mn [Member] Woodridge - Rochester, MN for development, expansion and renovation projects underway or recently completed. Dakota West Plaza - Minot , ND Dakota West Plaza Minot Nd [Member] Dakota West Plaza - Minot , ND for development, expansion and renovation projects underway or recently completed. Minot 1400 31st Ave - Minot, ND Minot140031 St Ave Minot Nd [Member] Minot 1400 31st Ave - Minot, ND property acquired or disposed. Minot IPS - Minot, ND Minot Ips Minot Nd [Member] Minot IPS - Minot, ND for development, expansion and renovation projects underway or recently completed. Woodbury 1865 Woodlane - Woodbury, MN Woodbury1865 Woodlane Woodbury Mn [Member] Woodbury 1865 Woodlane - Woodbury, MN for development, expansion and renovation projects underway or recently completed. Creekside Crossing - Bismarck, ND Creekside Crossing Bismarck Nd [Member] Creekside Crossing - Bismarck, ND Minot 1525 24th Ave SW - Minot, ND Minot152524th Ave S W Minot N D [Member] Minot 1525 24th Ave SW - Minot, ND Rapid City - Rapid City, SD Rapid City Rapid City Sd [Member] Rapid City - Rapid City, SD Weston - Weston, WI Weston Unimproved Land Weston Wi [Member] Weston Unimproved Land - Weston, WI for development, expansion and renovation projects underway or recently completed. SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] Real Estate And Accumulated Depreciation [Abstract] Real Estate And Accumulated Depreciation [Abstract] Encumbrances SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land Buildings & Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements Costs capitalized subsequent to acquisition SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Cost SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] Land SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount Buildings & Improvements SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount Total SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross Accumulated Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation Life on which depreciation in latest income statement is computed SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] Balance at beginning of year Additions SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Addition Improvements and Other SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements Total Additions Real Estate Total Additions Amount of additions made to real estate investments during the period. Cost of real estate sold SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold Impairment charge Real Estate Impairment Charge Impairment charge relating to real estate during the period. Write down of asset and accumulated depreciation on impaired assets SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount Transfers Property, Plant and Equipment, Transfers and Changes Development placed in service Development placed in service Transfer of development in progress to placed in service. Other SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Deduction Balance at close of year Total real estate investments Investments SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] Balance at beginning of year Additions during year [Abstract] Real Estate Accumulated Depreciation additions during year [Abstract] Provisions for depreciation SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense Deductions during year [Abstract] Real estate accumulated depreciation deductions during year [Abstract] Accumulated depreciation on real estate sold or classified as held for sale SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Investment in Real Estate Sold Other SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Other Deduction Balance at close of year Net basis of real estate investments for federal income tax purposes SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Income Statement [Abstract] EXPENSES Costs and Expenses [Abstract] Property operating expenses, excluding real estate taxes Property Operating Expenses Excluding Real Estate Taxes Operating costs relating to properties incurred during the reporting period but excluding real estate taxes. Real estate taxes Real Estate Tax Expense Property management expense Casualty (gain) loss Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Impairment of real estate investments Impairment of Real Estate, Continuing Operations The charge against earnings in the period to reduce the carrying amount of real property relating to continuing operations to fair value. General and administrative expenses Acquisition and investment related costs Business Combination, Acquisition Related Costs TOTAL EXPENSES Costs and Expenses Operating income (loss) Operating Income (Loss) Interest income Investment Income, Interest Other income Other Nonoperating Income (Expense) Income (loss) from discontinued operations Net (income) loss attributable to noncontrolling interests – Operating Partnership Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Nonredeemable Net (income) loss attributable to noncontrolling interests – consolidated real estate entities Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Nonredeemable Net income (loss) attributable to controlling interests Dividends to preferred shareholders Redemption of preferred shares Preferred Stock Redemption Premium NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS Earnings (loss) per common share from continuing operations – basic and diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Earnings (loss) per common share from discontinued operations – basic and diluted (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share NET EARNINGS (LOSS) PER COMMON SHARE – BASIC & DILUTED (in dollars per share) SHAREHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Assets Other Assets [Member] Accounts Payable and Accrued Expenses Accounts Payable and Accrued Liabilities [Member] Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Contract Interest Rate Contract [Member] Interest Rate Swap Interest Rate Swap [Member] Derivative [Line Items] Derivative [Line Items] Cash flow hedge gain (loss) to be reclassified within twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Number of instruments held Derivative Asset, Number of Instruments Held Notional amount Derivative Asset, Notional Amount Derivative instrument - interest rate swap Derivative Asset Derivative Liability Derivative Liability Gain (Loss) Recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Interest expense Net income (loss) BASIS OF PRESENTATION Basis of Accounting, Policy [Policy Text Block] CONSOLIDATION Consolidation, Policy [Policy Text Block] USE OF ESTIMATES Use of Estimates, Policy [Policy Text Block] RECENT ACCOUNTING PRONOUNCEMENTS New Accounting Pronouncements, Policy [Policy Text Block] RECLASSIFICATIONS Reclassification, Policy [Policy Text Block] REAL ESTATE INVESTMENTS Real Estate, Policy [Policy Text Block] CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS AND PROPERTY AND EQUIPMENT Property, Plant and Equipment, Policy [Policy Text Block] REAL ESTATE HELD FOR SALE Real Estate Held for Development and Sale, Policy [Policy Text Block] CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Policy [Policy Text Block] RESTRICED CASH Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] REVENUE Revenue from Contract with Customer [Policy Text Block] INCOME TAXES Income Tax, Policy [Policy Text Block] VARIABLE INTEREST ENTITY Consolidation, Variable Interest Entity, Policy [Policy Text Block] Statement of Financial Position [Abstract] ASSETS Real estate investments Investments [Abstract] Total real estate investments Other assets LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Liabilities and Equity [Abstract] LIABILITIES Liabilities [Abstract] Liabilities held for sale and liabilities of discontinued operations Disposal Group, Including Discontinued Operation, Liabilities Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Term loans, net of unamortized loan costs of $1,009, $486 and $0, respectively Unsecured Debt Mortgages payable, net of unamortized loan costs of $1,777, $2,221 and $3,054, respectively Construction debt Construction Debt And Other Liabilities This element represents loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs and the aggregate carrying amount of other liabilities, as of the balance sheet date. TOTAL LIABILITIES Liabilities COMMITMENTS AND CONTINGENCIES (NOTE 13) Commitments and Contingencies REDEEMABLE NONCONTROLLING INTERESTS – CONSOLIDATED REAL ESTATE ENTITIES EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Investors Real Estate Trust shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Preferred Shares of Beneficial Interest (Cumulative redeemable preferred shares) Preferred Stock, Value, Issued Common Shares of Beneficial Interest (Unlimited authorization, no par value, 11,942,372 shares issued and outstanding at December 31, 2018, 11,952,598 shares issued and outstanding at April 30, 2018 and 12,119,930 shares issued and outstanding at April 30, 2017) Accumulated distributions in excess of net income Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total Investors Real Estate Trust shareholders’ equity Stockholders' Equity Attributable to Parent Noncontrolling interests – consolidated real estate entities Noncontrolling Interest in Preferred Unit Holders Total equity TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Liabilities and Equity Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] 187 unit - Avalon Cove - Rochester, MN Avalon Cove Rochester Mn Units [Member] Refers to Avalon Cove, Rochester, MN Units. Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Escrow Deposits Escrow Deposits [Member] Escrow Deposits Tax-Deferred Exchange Proceeds Tax-Deferred Exchange Proceeds [Member] Tax-Deferred Exchange Proceeds [Member] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Service Life Service Life [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Assets Held for Sale Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Discontinued Operations Discontinued Operations [Member] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Commercial Properties Commercial Real Estate [Member] Land Land [Member] Industrial Commercial Industrial [Member] A business segment for reporting the information separately. Retail Site Retail Site [Member] Office Commercial Office [Member] A business segment for reporting the information separately. Commercial Healthcare Commercial Healthcare [Member] A classification of real estate for buildings, offices and campuses leased to members or organizations within the healthcare industry, but owned and operated by third party groups. Office Property Office Property [Member] Property that is used for office purpose. Medical Property Medical Property [Member] Property that is used for medical purpose. Grand Forks, North Dakota Grand Forks, North Dakota [Member] Grand Forks, North Dakota [Member] Bloomington, Minnesota Bloomington, Minnesota [Member] Bloomington, Minnesota [Member] Woodbury, Minnesota Woodbury, Minnesota [Member] Woodbury, Minnesota [Member] Minot, ND - property Impaired Property Minot N D [Member] Represents the impaired property and unimproved land in Minot, ND. Bismark, North Dakota - First Property Bismark, North Dakota - First Property [Member] Bismark, North Dakota - First Property [Member] Bismark, North Dakota Bismark, North Dakota [Member] Bismark, North Dakota [Member] Bismark, North Dakota - Second Property Bismark, North Dakota - Second Property [Member] Bismark, North Dakota - Second Property [Member] Williston, ND - property Impaired Property Williston Nd [Member] Represents the impaired properties and unimproved land in Williston, ND. Williston, ND - property 1 Impaired Property One Williston Nd [Member] Represents the first of three impaired multifamily properties in Williston, ND. Williston, ND - property 2 Impaired Property Two Williston Nd [Member] Represents the second of three impaired multifamily properties in Williston, ND. Williston, ND - property 3 Impaired Property Three Williston Nd [Member] Represents the third of three impaired multifamily properties in Williston, ND. Eden Prairie Minnesota Eden Prairie Minnesota [Member] Name of the property located in Eden Prairie, Minnesota. Sartell, Minnesota, Healthcare Property Sartell Minnesota [Member] Healthcare property located in Sartell, Minnesota. Grand Chute, Wisconsin, Unimproved Land Grand Chute Wisconsin Unimproved Land [Member] Grand Chute, Wisconsin, unimproved land St Cloud Minnesota St Cloud Minnesota [Member] The name of property located in St. Cloud, Minnesota. River Falls Wisconsin River Falls Wisconsin [Member] The name of property located in River Falls, Wisconsin. Buildings and Improvements Building and Building Improvements [Member] Furniture, Fixtures and Equipment Furniture and Fixtures [Member] Renovations and Improvements Renovations And Improvements [Member] Other facility held for productive use including, but not limited to, office, production, storage and distribution facilities and any addition, improvement, or renovation to the structure, for example, but not limited to, interior masonry, interior flooring, electrical, and plumbing. Property With Previous Nine Year Life Property With Previous Nine Year Life [Member] Represents buildings and improvements with previously recorded nine year life. BASIS OF PRESENTATION [Abstract] BASIS OF PRESENTATION [Abstract] Interest in operating partnership (in hundredths) Interest in operating partnership The entity's ownership interest in the operating partnership. Percentage of general interest partnership (in hundredths) Percentage of general interest partnership The entity's ownership interest in the general partnership included in operating partnership interest. Reverse stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Common Shares of Beneficial Interest, shares issued (in shares) Common Stock, Shares, Issued Reverse stock split, units (in shares) Limited Partners' Capital Account, Units Issued REAL ESTATE INVESTMENTS [Abstract] Real Estate Investments, Net [Abstract] Real estate investments Estimated useful life of assets (in years) Construction period interest capitalized Real Estate Inventory, Capitalized Interest Costs Incurred IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] Asset Impairment Charges [Abstract] Number of impaired properties Number of impaired properties The number of impaired properties for the fiscal year. Interest in joint venture Equity Method Investment, Ownership Percentage CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] Accounting Changes and Error Corrections [Abstract] Useful life Property, Plant and Equipment, Useful Life Depreciation Depreciation Net income HELD FOR SALE [Abstract] Assets Held-for-sale, Not Part of Disposal Group [Abstract] Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price The number of year after the date of acquisition related to adjustment of real estate preliminary allocations of the purchase price. Number of real estate properties classified as held for sale Number of real estate properties classified as held for sale Number of real estate properties classified as held for sale. RESTRICTED CASH [Abstract] Restricted Cash and Investments [Abstract] PROPERTY AND EQUIPMENT [Abstract] Property, Plant and Equipment [Abstract] Property and equipment cost Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment INCOME TAXES [Abstract] Income Tax Disclosure [Abstract] Minimum dividend distribution percentage Minimum dividend distribution percentage The minimum dividend distribution percentage under section 856-860 of Internal Revenue Code of 1986, as amended. Dividend distribution percentage (in hundredths) Dividend distribution percentage The dividend distributed (in percentage) made by the entity during the year. Distribution of federal income tax (in hundredths) Distribution made under federal income tax Distribution made by the entity under federal income tax. Distribution of capital gain (in hundredths) Distribution made under capital gain Distribution made by the entity under capital gain . Distribution made as return of capital (in hundredths) Distribution made as return of capital The distribution made by the entity as return of capital. MORTGAGE LOANS RECEIVABLE AND NOTES RECEIVABLE [Abstract] Financing Receivable, Net [Abstract] Number of real estate properties sold Number Of Real Estate Properties Sold The number of real estate properties sold during the period. Mortgage loans receivable Loans Receivable, Gross, Commercial, Mortgage Interest rate on mortgages payable SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate Proceeds from collection of loans receivable Number of real estate properties released Number Of Real Estate Properties Released Number Of Real Estate Properties Released Loan commitment Loans and Leases Receivable, Loans in Process GAIN ON BARGAIN PURCHASE [Abstract] Business Combination, Bargain Purchase [Abstract] Total acquisition costs Shares exchanged (in shares) Stock Issued During Period, Shares, Acquisitions Shares exchanged Stock Issued During Period, Value, Acquisitions Maximum contribution each employee, towards 401(k) plan Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employer contribution towards profit sharing plan and 401(k) plan Defined Contribution Plan, Cost Maximum contribution each employee, towards 401(k) plan, increase Defined Contribution Plan, Maximum Annual Contributions Per Employee, Increase (Decrease), Percent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Increase (Decrease), Percent Discretionary employer contribution Defined Contribution Plan Employer Discretionary Contribution Percent Percentage of discretionary contributions made by an employer to a defined contribution plan. Schedule of Noncontrolling Interests - Consolidated Real Estate Entities Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Subsequent Events [Abstract] Schedule of Derivative Assets at Fair Value Schedule of Derivative Assets at Fair Value [Table Text Block] Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Other Other Disposition [Member] A business segment for reporting the information separately. Healthcare Commercial Medical [Member] A business segment for reporting the information separately. Disposed of by Sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Dakota Commons Williston Nd Dakota Commons Williston Nd [Member]