Earnings Per Share [Abstract] Ratio of unites exchanged for shares Ratio Of Units Exchanged For Shares The description of ratio of units exchanged for shares. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Performance Shares and Restricted Stock Units Performance Shares And Restricted Stock Units [Member] Performance Shares And Restricted Stock Units [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount NUMERATOR Net Income (Loss) Attributable to Parent [Abstract] Income (loss) from continuing operations – controlling interests Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income (loss) from discontinued operations – controlling interests Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income (loss) attributable to controlling interests Net Income (Loss) Attributable to Parent Dividends to preferred shareholders Dividends, Preferred Stock1 Total equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period. NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS Net Income (Loss) Available to Common Stockholders, Basic Noncontrolling interests – Operating Partnership Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Nonredeemable Numerator for diluted earnings (loss) per share Net Income (Loss) Available to Common Stockholders, Diluted DENOMINATOR Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator for basic earnings per share weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of redeemable operating partnership units (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Denominator for diluted earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted 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) Earnings Per Share, Basic and Diluted Fair Value Disclosures [Abstract] Fair Value Measurements on a Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Estimated Fair Values of Financial Instruments Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Debt Disclosure [Abstract] Schedule of Debt Schedule of Long-term Debt Instruments [Table Text Block] Aggregate Amount of Required Future Principal Payments on Mortgages Payable Schedule of Maturities of Long-term Debt [Table Text Block] Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Commons and Landing at Southgate Partnership Commons and Landing at Southgate Partnership [Member] Commons and Landing at Southgate Partnership [Member] Class of Stock [Line Items] Class of Stock [Line Items] Noncontrolling interest acquired Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Payments for acquisition of noncontrolling interests Payments to Acquire Additional Interest in Subsidiaries Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] December 31, 2018 Temporary Equity, Carrying Amount, Attributable to Parent Net income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Acquisition of redeemable noncontrolling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests March 31, 2019 Accounting Policies [Abstract] BASIS OF PRESENTATION Consolidation, Policy [Policy Text Block] UNAUDITED INTERIM CONSOLIDATED FINANCIAL STATEMENTS Basis of Accounting, Policy [Policy Text Block] USE OF ESTIMATES Use of Estimates, Policy [Policy Text Block] RECENT ACCOUNTING PRONOUNCEMENTS New Accounting Pronouncements, Policy [Policy Text Block] REVENUES Revenue from Contract with Customer [Policy Text Block] IMPAIRMENT OF LONG-LIVED ASSETS Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] VARIABLE INTEREST ENTITIES Consolidation, Variable Interest Entity, Policy [Policy Text Block] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Share Repurchase Program Share Repurchase Program [Member] Refers to share repurchase program. Share Repurchase Program Equity, Class of Treasury Stock [Line Items] Aggregate gross sales price of common share of beneficial interest allowed to be repurchased Stock Repurchase Program, Authorized Amount Repurchase period Stock Repurchase Program, Period in Force Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Shares repurchased and retired (in shares) Stock Repurchased and Retired During Period, Shares Aggregate cost of common shares repurchased and retired Stock Repurchased and Retired During Period, Value Average cost per share (in dollars per share) Stock Repurchased And Retired During Period, Average Cost Per Share Stock Repurchased And Retired During Period, Average Cost Per Share BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] 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] 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] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Line of Credit Domestic Line of Credit [Member] 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] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Number of real estate properties Number of Real Estate Properties Number of real estate properties, serving as collateral for mortgage loans Number Of Real Estate Properties, Collateral Number Of Real Estate Properties, Collateral Number of material defaults or instances of noncompliance 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 Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Revolving lines of credit Long-term Line of Credit 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 Debt instrument face amount Debt Instrument, Face Amount Term Debt Instrument, Term Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Conversion of Stock [Table] Conversion of Stock [Table] Stock Conversion Description [Axis] Stock Conversion Description [Axis] Conversion of Stock, Name [Domain] Conversion of Stock, Name [Domain] Exercise of Exchange Rights Exercise of Exchange Rights [Member] Exercise of Exchange Rights [Member] Conversion of Stock [Line Items] Conversion of Stock [Line Items] Number of units converted (in shares) Conversion of Stock, Shares Converted Units converted, aggregate cost Conversion of Stock, Amount Converted Average price of shares issued (in dollars per share) Sale of Stock, Average Price Per Share Average Price Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. Redemption of units for common shares (in shares) Partners' Capital Account, Units, Redeemed Redemption of units for common shares Partners' Capital Account, Redemptions Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series D Preferred Units Series D Preferred Units [Member] Series D Preferred Units [Member] Temporary Equity [Line Items] Temporary Equity [Line Items] Preferred units, shares issued (in shares) Temporary Equity, Shares Issued Preferred units, par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Distribution rate Temporary Equity, Distribution Rate Temporary Equity, Distribution Rate Partnership units, converted (in shares) Partners' Capital Account, Units, Converted Conversion price (in dollars per share) Partners' Capital Account, Units, Converted, Conversion Price Partners' Capital Account, Units, Converted, Conversion Price Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Term Loans Medium-term Notes [Member] Statement [Line Items] Statement [Line Items] LIABILITIES, MEZZANINE EQUITY, AND EQUITY Liabilities and Equity [Abstract] LIABILITIES Liabilities [Abstract] Mortgages payable, loan costs Debt Issuance Costs, Net Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred units, shares outstanding (in shares) Temporary Equity, Shares Outstanding Preferred units, liquidation preference Temporary Equity, Liquidation Preference Preferred shares of beneficial interest, liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Preferred shares of beneficial interest, shares issued (in shares) Preferred Stock, Shares Issued Preferred shares of beneficial interest, shares outstanding (in shares) Preferred Stock, Shares Outstanding Preferred shares liquidation preference Preferred Stock, Liquidation Preference, Value Common shares of beneficial interest, shares issued (in shares) Common Stock, Shares, Issued Common shares of beneficial interest, shares outstanding (in shares) Common Stock, Shares, Outstanding Noncontrolling interests - operating partnership (in shares) Noncontrolling Interests Operating Partnership Units Number of partnership units held by noncontrolling interests as of the balance sheet date. Business Combinations [Abstract] ACQUISITIONS AND DISPOSITIONS Mergers, Acquisitions and Dispositions Disclosures [Text Block] 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] Statement of Stockholders' Equity [Abstract] Distributions - common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Distributions - preferred shares (in dollars per share) Preferred Stock, Dividends Per Share, Declared Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Land Land [Member] Commercial Properties Commercial Properties [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. Unimproved Land Unimproved Land [Member] A business segment for reporting the information separately. Other Other Disposition [Member] A business segment for reporting the information separately. Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposed of by Sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Creekside Crossing - Bismarck, ND Creekside Crossing Bismarck Nd [Member] Creekside Crossing - Bismarck, ND 43,404 sq ft Garden View - St. Paul, MN Garden View - St. Paul MN [Member] Garden View - St. Paul MN [Member] 52,116 sq ft Ritchie Medical - St. Paul, MN Ritchie Medical - St. Paul MN [Member] Ritchie Medical - St. Paul MN [Member] 22,187 sq ft Bismarck 715 East Broadway - Bismarck, ND Bismarck715 East Broadway Bismarck Nd [Member] Bismarck 715 East Broadway - Bismarck, ND for development, expansion and renovation projects underway or recently completed. Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Number of properties sold Number of properties sold The number of properties sold during the period. Sales Price Disposal Group, Including Discontinued Operation, Consideration Book value and sale cost Disposal Group, Including Discontinued Operation, Asset Net Book Value and Sale Cost Disposal Group, Including Discontinued Operation, Asset Net Book Value and Sale Cost Gain/(Loss) Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Area of real estate property Area of Real Estate Property Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Term of contract Lessor, Operating Lease, Term of Contract Operating Leases, Income Statement, Lease Revenue, Total Operating Leases, Income Statement, Lease Revenue, Total Operating Leases, Income Statement, Lease Revenue, Total Operating Leases, Lease Income [Abstract] Operating Leases, Lease Income [Abstract] Rental revenue Operating Lease, Lease Income Lease income - operating leases Operating Leases, Income Statement, Lease Revenue Non-lease components Lease Income, Non-Lease Components Lease Income, Non-Lease Components Total lease income - included in Revenue Lease Income Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] 2019 (remainder) Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year 2020 Lessor, Operating Lease, Payments to be Received, Two Years 2021 Lessor, Operating Lease, Payments to be Received, Three Years 2022 Lessor, Operating Lease, Payments to be Received, Four Years 2023 Lessor, Operating Lease, Payments to be Received, Five Years Thereafter Lessor, Operating Lease, Payments to be Received, Thereafter Total Lessor, Operating Lease, Payments to be Received Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] 2019 Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total payments Long-term Debt Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations, Held-for-sale Discontinued Operations, Held-for-sale [Member] Number of real estate properties classified as held for sale in discontinued operations Number of real estate properties classified as held for sale in discontinued operations Number of real estate properties classified as held for sale in discontinued operations. Assets Disposal Group, Including Discontinued Operation, Assets Liabilities Disposal Group, Including Discontinued Operation, Liabilities DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [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 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 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 Reverse stock split Stockholders' Equity Note, Stock Split, Conversion Ratio Schedule of Acquisitions Schedule of Business Acquisitions, by Acquisition [Table Text Block] 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). Schedule of Real Estate Properties [Table] Schedule of Real Estate Properties [Table] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] 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. Real Estate Properties [Line Items] Real Estate Properties [Line Items] Impairment of real estate investments Impairment of real estate continuing and discontinued operations Impairment of real estate continuing and discontinued operations. MORTGAGE RECEIVABLE AND NOTES RECEIVABLE 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 Loans receivable, communities remaining in the pool of assets used to secure the mortgage Loans Receivable, Gross, Commercial, Mortgage, Communities In Pool Of Assets Loans Receivable, Gross, Commercial, Mortgage, Communities In Pool Of Assets Interest rate SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate Interest income Investment Income, Interest Loan commitment Loans and Leases Receivable, Loans in Process Disclosure of Compensation Related Costs, Share-based Payments [Abstract] SHARE-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Tranche One Share-based Compensation Award, Tranche One [Member] Tranche Two Share-based Compensation Award, Tranche Two [Member] Tranche Three Share-based Compensation Award, Tranche Three [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Management Management [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2015 Incentive Plan Incentive Plan 2015 [Member] Financial information relating to the 2015 stock based compensation plan, long term incentive plan. Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Award In 2019 Award In 2019 [Member] Award In 2019 [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Relative TSR 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"). Performance Shares Performance Shares [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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. Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Total unvested restricted share awards (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Percentage of the RSUs 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, Equity Instruments Other than Options, Nonvested, Number, Percentage Of Restricted Stock Units Awarded Restricted shares vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 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 (in hundredths) 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 Stock-based compensation expense Allocated Share-based Compensation Expense FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] 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 Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Product Concentration Risk Product Concentration Risk [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Rental Revenue Rental Revenue [Member] Rental Revenue Other Property Revenue Other Property Revenue [Member] Other Property Revenue [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Description of timing Revenue, Performance Obligation, Description of Timing Percent of Revenue Concentration Risk, Percentage Other property revenue Revenue from Contract with Customer, Excluding Assessed Tax Revenues Revenues EQUITY AND MEZZANINE EQUITY Stockholders' Equity Note Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized gain (loss) from derivative instrument Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Unrealized gain (loss) from derivative instrument Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax (Gain) loss on derivative instrument reclassified into earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax (Gain) loss on derivative instrument reclassified into earnings Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, after Tax Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Net comprehensive (income) loss attributable to noncontrolling interests – Operating Partnership Comprehensive Income Attributable To Noncontrolling Interest, Operating Partnership Comprehensive Income Attributable To Noncontrolling Interest, Operating Partnership Net (income) loss attributable to noncontrolling interests – consolidated real estate entities Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Nonredeemable Comprehensive income (loss) attributable to controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Real Estate Real Estate [Member] Management Service Management Service [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Multifamily All Other Other Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Segment revenues and net operating income [Abstract] Segment Reporting Information, Profit (Loss) [Abstract] REVENUE Property operating expenses, including real estate taxes Property Operating Expense Property Operating Expense Net operating income Net Operating Income (Loss) Net Operating Income (Loss) Property management Cost of Goods and Services Sold Casualty gain (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. General and administrative expenses General and Administrative Expense 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 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 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) Segment assets 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 Other assets 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 DEBT Debt Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Subject to Restrictions on Taxable Dispositions Subject To Restrictions On Taxable Dispositions [Member] Refers to a property subject to restrictions on taxable dispositions. Number of properties Number of apartment units Number of Units in Real Estate Property Organization, Consolidation and Presentation of Financial Statements [Abstract] ORGANIZATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] PREFERRED SHARES Preferred Stock [Member] COMMON SHARES Common Stock [Member] ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME Retained Earnings [Member] ACCUMULATED OTHER COMPREHENSIVE INCOME Comprehensive Income [Member] NONREDEEMABLE NONCONTROLLING INTERESTS Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance (in shares) Shares, Issued Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Change in fair value of derivatives Other Comprehensive Income (Loss), Change In Fair Value Of Derivatives Other Comprehensive Income (Loss), Change In Fair Value Of Derivatives Distributions – common shares and units ($0.70 per share and unit) Dividends, Common Stock Distributions – Series C preferred shares ($0.4140625 per Series C share) Dividends, Preferred Stock 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 Redemption of units for common shares 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 Acquisition of redeemable noncontrolling interests Noncontrolling Interest, Increase from Business Combination Other Stockholders' Equity, Other Balance Balance (in shares) SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Apartment Properties Residential Real Estate [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Cash flow hedge gain (loss) to be reclassified within twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Derivative [Table] Derivative [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Derivative [Line Items] Derivative [Line Items] Number of instruments held Derivative Asset, Number of Instruments Held Notional amount Derivative Asset, Notional Amount 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 loss Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction General and administrative expenses TOTAL EXPENSES Costs and Expenses Operating income (loss) Operating Income (Loss) Interest expense Other income Other Nonoperating Income (Expense) Income (loss) from continuing operations Dividends to preferred unitholders Preferred Stock Dividends, Income Statement Impact Net (income) loss attributable to noncontrolling interests – Operating Partnership Net (income) loss attributable to noncontrolling interests – consolidated real estate entities Dividends to preferred shareholders 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] Gain (Loss) Reclassified from Accumulated OCI into Income Reclassification out of Accumulated Other Comprehensive Income [Member] Total derivatives in cash flow hedging relationships - Interest rate contracts Interest Rate Contract [Member] Fair value Derivative Asset Derivative liability Derivative Liability Gain (Loss) Recognized in OCI Interest expense EXPENSES Operating income (loss) Disposal Group, Including Discontinued Operation, Operating Income (Loss) Income (loss) from discontinued operations before gain (loss) on sale of discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Gain (loss) on sale of discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax INCOME (LOSS) FROM DISCONTINUED OPERATIONS New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Right of use asset Operating Lease, Right-of-Use Asset Lease liability Operating Lease, Liability Schedule of New Accounting Pronouncements Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of Cash, Cash Equivalents, and Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Operating Lease Income Operating Lease, Lease Income [Table Text Block] Future Scheduled Lease Income for Operating Leases Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] 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. 272 homes - SouthFork Townhomes- Lakeville, MN SouthFork - Lakeville, MN [Member] SouthFork - Lakeville, MN [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] Number of homes Acquisition costs Business Combination, Consideration Transferred Form of consideration, cash Payments to Acquire Businesses, Gross Form of consideration, units Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 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 ASSETS Real estate investments Investments [Abstract] Total real estate investments Investments Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Term loans, net of unamortized loan costs of $964 and $1,009, respectively Unsecured Debt Mortgages payable, net of unamortized loan costs of $1,637 and $1,777, respectively TOTAL LIABILITIES Liabilities COMMITMENTS AND CONTINGENCIES (NOTE 6) Commitments and Contingencies REDEEMABLE NONCONTROLLING INTERESTS – CONSOLIDATED REAL ESTATE ENTITIES Redeemable Noncontrolling Interest, Equity, Carrying Amount SERIES D PREFERRED UNITS (Cumulative convertible preferred units, $100 par value, 166 units issued and outstanding at March 31, 2019 and no units issued and outstanding at December 31, 2018, aggregate liquidation preference of $16,560) Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests EQUITY Series C Preferred Shares of Beneficial Interest (Cumulative redeemable preferred shares, no par value, $25 per share liquidation preference, 4,118 shares issued and outstanding at March 31, 2019 and December 31, 2018, aggregate liquidation preference of $102,971) Preferred Stock, Value, Issued Common Shares of Beneficial Interest (Unlimited authorization, no par value, 11,768 shares issued and outstanding at March 31, 2019 and 11,942 shares issued and outstanding at December 31, 2018) Common Stock, Value, Issued Accumulated distributions in excess of net income Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Stockholders' Equity Attributable to Parent Noncontrolling interests – Operating Partnership (1,365 units at March 31, 2019 and 1,368 units at December 31, 2018) Noncontrolling Interest in Operating Partnerships Noncontrolling interests – consolidated real estate entities Noncontrolling Interest in Preferred Unit Holders Total equity TOTAL LIABILITIES, MEZZANINE EQUITY, AND EQUITY Liabilities and Equity 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, including amortization of capitalized loan costs Depreciation, Depletion and Amortization (Gain) loss on sale of real estate, land, other investments and discontinued operations Share-based compensation expense Share-based Compensation Other, net Other Noncash Income (Expense) 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 by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Increase in notes receivable Payments to Acquire Notes Receivable 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. Payments for acquisitions of real estate assets Payments to Acquire Real Estate Payments for improvements of real estate assets Payments for Capital Improvements Other investing activities Payments for (Proceeds from) Other Investing Activities Net cash provided by (used by) investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] 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 Principal payments on construction debt Repayments of Construction Loans Payable Payments for acquisition of noncontrolling interests – consolidated real estate entities Repurchase of common shares Payments for Repurchase of Common 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 by (used by) financing activities Net Cash Provided by (Used in) Financing Activities 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, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES Supplemental Cash Flow Information [Abstract] Accrued capital expenditures 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. Distributions declared but not paid Dividends Payable Property acquired through issuance of Series D preferred units Noncash or Part Noncash Acquisition, Value of Assets Acquired SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Supplemental Disclosure of Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Revenues and Net Operating Income for Reportable Segments Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Segment Assets and Accumulated Depreciation Reconciliation of Assets from Segment to Consolidated [Table Text Block] Primary Line Of Credit Primary Line Of Credit [Member] Primary Line Of Credit [Member] Operating Line Of Credit Operating Line Of Credit [Member] Operating Line Of Credit [Member] Secured Debt Secured Debt [Member] Mortgages payable - fixed Fixed Rate Mortgages Payable [Member] Fixed Rate Mortgages Payable [Member] Carrying principal balance Long-term Debt, Gross Weighted Average Maturity in Years at March 31, 2019 Debt Instrument, Weighted Average Maturity Debt Instrument, Weighted Average Maturity Weighted average interest rate Debt, Weighted Average Interest Rate COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Schedule of Conversions of Stock Schedule of Conversions of Stock [Table Text Block] Schedule of Repurchase Program Schedule of Repurchase Agreements [Table Text Block] Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] EARNINGS PER SHARE Earnings Per Share [Text Block] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Preferred shares outstanding (in shares) Preferred shares, liquidation preference (in dollars per share) Preferred shares, annual distribution accrual rate Preferred Stock, Annual Distribution Accrual Rate Preferred Stock, Annual Distribution Accrual Rate Preferred shares, dividend rate Preferred Stock, Dividend Rate, Percentage Schedule of Fair Value of Derivative Instruments Schedule of Derivative Assets at Fair Value [Table Text Block] Schedule of Derivative Instruments Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Effect on Net Income and Gains or Losses From Sale Of Properties Classified as Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] 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 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 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. FINANCIAL ASSETS Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Mortgage and note receivable Receivables, Fair Value Disclosure FINANCIAL LIABILITIES Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Revolving lines of credit Lines of Credit, Fair Value Disclosure Term loan Loans Payable, Fair Value Disclosure Mortgages payable Equity Common stock outstanding (in shares) Equity awards issued (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Total grant-date value shares issued Stock Issued During Period, Value, New Issues