Other Liabilities Disclosure [Abstract] Acquired Lease Intangible Liabilities, Net Other Liabilities Disclosure [Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series D Preferred Stock Series D Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Preferred shares, par (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred shares, shares authorized Preferred Stock, Shares Authorized Cumulative convertible perpetual preferred shares, liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Cumulative convertible perpetual preferred shares, shares issued Preferred Stock, Shares Issued Cumulative convertible perpetual preferred shares, shares outstanding Preferred Stock, Shares Outstanding Cumulative convertible perpetual preferred shares, dividend rate percentage Preferred Stock, Dividend Rate, Percentage Common shares of beneficial interest, par (in dollars per share) Common Stock, Par or Stated Value Per Share Common shares of beneficial interest, shares authorized Common Stock, Shares Authorized Common shares of beneficial interest, shares issued Common Stock, Shares, Issued Common shares of beneficial interest, shares outstanding Common Stock, Shares, Outstanding Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Unsecured term loan facility with: 1.460 % Swap Rate, Expiration Date 05/2020 Interest Rate Contract One [Member] Interest Rate Contract One Unsecured term loan facility with: 1.498 % Swap Rate, Expiration Date 05/2021 Interest Rate Contract Nine [Member] Interest Rate Contract Nine [Member] Unsecured term loan facility with: 1.490 % Swap Rate, Expiration Date 05/2021 Interest Rate Contract Eight [Member] Interest Rate Contract Eight [Member] Unsecured term loan facility with: 1.480 % Swap Rate, Expiration Date 05/2021 Interest Rate Contract Five [Member] Interest Rate Contract Five [Member] Total derivative assets - Forward swaps Interest Rate Swap [Member] Unsecured term loan facility with: 2.048 % Swap Rate, Expiration Date 10/2018 Interest Rate Contract Two [Member] Interest Rate Contract Two Unsecured term loan facility with: 1.850 % Swap Rate, Expiration Date 10/2018 Interest Rate Contract Three [Member] Interest Rate Contract Three Unsecured term loan facility with: 1.840 % Swap Rate, Expiration Date 10/2018 Interest Rate Contract Four [Member] Interest Rate Contract Four Unsecured term loan facility with: 2.150 % Swap Rate, Expiration Date 05/2020 Interest Rate Contract Six [Member] Interest Rate Contract Six [Member] Unsecured term loan facility with: 2.150 % Swap Rate, Expiration Date 05/2020 Interest Rate Contract Seven [Member] Interest Rate Contract Seven [Member] Total derivative asset/liabilities interest rate contracts Interest Rate Contract [Member] Derivative [Line Items] Derivative [Line Items] Derivative asset, notional value Derivative Asset, Notional Amount Derivative liability, notional value Derivative Liability, Notional Amount Fixed Rate Derivative, Fixed Interest Rate Derivative assets, fair value Interest Rate Derivative Assets, at Fair Value Derivative liability, fair value Interest Rate Cash Flow Hedge Liability at Fair Value Real Estate [Abstract] Schedule of Impaired Long-Lived Assets Held and Used [Table] Schedule of Impaired Long-Lived Assets Held and Used [Table] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Land available for development or sale Land Held For Development Or Sale [Member] Land Held for Development or Sale Income producing properties marketed for sale Income Producing Property [Member] Income Producing Property [Member] Impaired Long-Lived Assets Held and Used [Line Items] Impaired Long-Lived Assets Held and Used [Line Items] Provision for impairment Impairment of Real Estate Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Total consolidated income producing dispositions Income Producing Property Dispositions [Member] Income Producing Property Dispositions [Member] The Town Center at Aquia Office Building Town Center At Aquia Office Building [Member] Town Center at Aquia Office Building [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Total revenue from acquisitions included in consolidated statement of operations Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Net income from acquisitions included in consolidated statement of operations Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Net proceeds from sales of real estate Escrow Deposits Related to Property Sales Secured debt Secured Debt Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative assets - interest rate swaps Derivative liabilities - interest rate swaps Interest Rate Derivative Liabilities, at Fair Value Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Lease originations costs Loan Origination Commitments [Member] Above market leases Above Market Leases [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Acquired lease intangible assets Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Net acquired lease intangibles Finite-Lived Intangible Assets, Net Earnings Per Share [Abstract] Earnings per Common Share Earnings Per Share [Text Block] ASSETS Assets [Abstract] Income producing properties, at cost: Real Estate Investment Property, at Cost [Abstract] Land Land Buildings and improvements Investment Building and Building Improvements Less accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Income producing properties, net Real Estate Rental Property Net Represents a total which includes the following: (1) land; (2) investments in building and building improvements; (3) equipment; less the accumulated depreciation associated with (1) through (3). Construction in progress and land available for development or sale Land Held For Development Or Sale And Construction In Progress Carrying amount of land available for development or available for sale and long-lived assets under construction. Real estate held for sale Real Estate Held-for-sale Net real estate Real Estate Investment Property, Net Equity investments in unconsolidated joint ventures Equity Method Investments Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Accounts receivable, net Accounts Receivable, Net Acquired lease intangibles, net Other assets, net Other Assets TOTAL ASSETS Assets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Notes payable, net Long-term Debt Capital lease obligation Capital Lease Obligations Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities Acquired lease intangibles, net Off-market Lease, Unfavorable Other liabilities Other Liabilities Distributions payable Dividends Payable TOTAL LIABILITIES Liabilities Commitments and Contingencies Commitments and Contingencies Ramco-Gershenson Properties Trust (RPT) Shareholders' Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred shares, $0.01 par, 2,000 shares authorized: 7.25% Series D Cumulative Convertible Perpetual Preferred Shares, (stated at liquidation preference $50 per share), 1,849 shares issued and outstanding as of December 31, 2017 and 2016, respectively Preferred Stock, Value, Issued Common shares of beneficial interest, $0.01 par, 120,000 shares authorized, 79,366 and 79,272 shares issued and outstanding as of December 31, 2017 and 2016, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated distributions in excess of net income Accumulated Distributions in Excess of Net Income Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax TOTAL SHAREHOLDERS' EQUITY ATTRIBUTABLE TO RPT Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest TOTAL SHAREHOLDERS' EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity Equity Method Investments and Joint Ventures [Abstract] Summary of Combined Financial Information for Unconsolidated Entities, Balance Sheets Equity Method Investees Balance Sheet Data [Table Text Block] Equity Method Investees Balance Sheet Data [Table Text Block] Summary of Combined Financial Information for Unconsolidated Entities, Statements of Operations Equity Method Investees Income Statement Data [Table Text Block] Equity Method Investees Income Statement Data [Table Text Block] Summary of Unconsolidated Joint Venture Acquisition Activity Acquisition of Equity Method Investments [Table Text Block] Acquisition of Equity Method Investments [Table Text Block] Summary of Unconsolidated Joint Venture Disposition Activity Disposal Groups, Including Discontinued Operations [Table Text Block] Information for Fees Earned Schedule Of Management And Other Fee Income [Table Text Block] Schedule Of Management And Other Fee Income [Table 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] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Service-based restricted stock Service Based Awards [Member] Service Based Awards [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 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding at the beginning of the year (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Number The number of equity-based payment instruments that validly exist and are outstanding as of the balance sheet date. 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 or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding at the end of the year (in shares) Weighted- Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding at the beginning of the year (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 or expired (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 Outstanding at the beginning of the year (in dollars per share) Shares Under Option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at the beginning of the year (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding at the end of the year (in shares) Exercisable at the end of year (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Outstanding at the beginning of the year (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding at the end of the year (in dollars per share) Exercisable at the end of year (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Debt Disclosure [Abstract] Summary of Mortgages, Notes Payable and Capital Lease Obligations Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Principal Payments on Mortgages, Notes Payable, and Capital Lease Obligations Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Provisions for Impairment Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Accounting Policies [Abstract] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] As reported Scenario, Previously Reported [Member] Adjustment Restatement Adjustment [Member] Adjustments for Error Corrections [Axis] Adjustments for Error Corrections [Axis] Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] Prior Period Adjustment Related to Real Estate Tax Accrual Correction Prior Period Adjustment Related to Real Estate Tax Accrual Correction [Member] Prior Period Adjustment Related to Real Estate Tax Accrual Correction [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Distributions in Excess of Net Income Accumulated Distributions in Excess of Net Income [Member] Noncontrolling Interest Noncontrolling Interest [Member] Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Total liabilities Accumulated distributions in excess of net income Total shareholder's equity Equity Investments in Unconsolidated Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Income Statement [Abstract] REVENUE Real Estate Revenue, Net [Abstract] Minimum rent Operating Leases, Income Statement, Minimum Lease Revenue Percentage rent Operating Leases, Income Statement, Percentage Revenue Recovery income from tenants Tenant Reimbursements Other property income Other Real Estate Revenue Management and other fee income Management And Other Fee Income Revenue, as contractually stipulated, for managing and operating joint ventures and third-party properties during the reporting period. TOTAL REVENUE Real Estate Revenue, Net EXPENSES Costs and Expenses [Abstract] Real estate taxes Real Estate Tax Expense Recoverable operating expense Direct Costs of Leased and Rented Property or Equipment Other non-recoverable operating expense Other Cost and Expense, Operating Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Acquisitions costs Business Combination, Acquisition Related Costs General and administrative expense General and Administrative Expense Provision for impairment Asset Impairment Charges TOTAL EXPENSES Costs and Expenses OPERATING INCOME Operating Income (Loss) OTHER INCOME AND EXPENSES Nonoperating Income (Expense) [Abstract] Other expense, net Other Nonoperating Income (Expense) Gain on sale of real estate Gains (Losses) on Sales of Investment Real Estate Earnings from unconsolidated joint ventures Income (Loss) from Equity Method Investments Interest expense Interest Expense Other gain on unconsolidated joint ventures Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss) gain on extinguishment of debt NET INCOME BEFORE TAX Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax provision Income Tax Expense (Benefit) NET INCOME Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net (income) attributable to noncontrolling partner interest Net Income (Loss) Attributable to Noncontrolling Interest NET INCOME ATTRIBUTABLE TO RPT Net Income (Loss) Attributable to Parent Preferred share dividends Preferred Stock Dividends, Income Statement Impact Preferred share conversion costs Preferred Stock Dividends and Other Adjustments NET INCOME AVAILABLE TO COMMON SHAREHOLDERS Net Income (Loss) Available to Common Stockholders, Basic EARNINGS PER COMMON SHARE Earnings Per Share, Basic [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted WEIGHTED AVERAGE COMMON SHARES OUTSTANDING Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in fair value of interest rate swaps Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest COMPREHENSIVE INCOME ATTRIBUTABLE TO RPT Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accounting Changes and Error Corrections [Abstract] Retained Earnings Retained Earnings [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Calculated under Revenue Guidance in Effect before Topic 606 Calculated under Revenue Guidance in Effect before Topic 606 [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2017-12 Accounting Standards Update 2017-12 [Member] Accounting Standards Update 2017-12 [Member] Accounting Standards Update 2017-05 Accounting Standards Update 2017-05 [Member] Accounting Standards Update 2017-05 [Member] Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Business acquisition, transaction costs Business Acquisition, Transaction Costs Cumulative effect adjustment - ASU adoption Cumulative Effect of New Accounting Principle in Period of Adoption Amount of revenues requiring evaluation under new accounting pronouncement Other Real Estate Revenue And Management And Other Revenue Fee Income Other Real Estate Revenue And Management And Other Revenue Fee Income Percentage of revenue requiring evaluation under new accounting pronouncement Other Real Estate Revenue And Management And Other Revenue Fee Income, Percent Other Real Estate Revenue And Management And Other Revenue Fee Income, Percent Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Joint venture property acquisitions Joint Venture Property Acquisitions [Member] Joint Venture Property Acquisitions [Member] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Millennium Park Millennium Park [Member] Millennium Park [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] GLA Area of Real Estate Property Purchase Price Real Estate Assets Gross Purchase Price Real Estate Assets Gross Purchase Price ASSETS Equity Method Investment, Summarized Financial Information, Assets [Abstract] Investment in real estate, net Equity Method Investment Summarized Financial Information Real Estate Net Equity Method Investment, Summarized Financial Information, Real Estate, Net Other assets Equity Method Investment Summarized Financial Information Assets Other Assets Equity Method Investment Summarized Financial Information Assets Other Assets Total Assets Equity Method Investment, Summarized Financial Information, Assets LIABILITIES AND OWNERS' EQUITY Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] Mortgage notes payable Equity Method Investment Summarized Financial Information Liabilities Mortgage Notes Payable Equity Method Investment Summarized Financial Information Liabilities, Mortgage Notes Payable Other liabilities Equity Method Investment Summarized Financial Information Liabilities Other Liabilities Equity Method Investment Summarized Financial Information Liabilities Other Liabilities Owners' equity Equity Method Investment, Summarized Financial Information, Equity Excluding Noncontrolling Interests Total Liabilities and Owners' Equity Equity Method Investment, Summarized Financial Information, Liabilities and Equity RPT's equity investments in unconsolidated joint ventures Income Tax Disclosure [Abstract] Minimum Percentage Of Taxable Income Distribution To Shareholders Minimum Percentage Of Taxable Income Distribution To Shareholders Minimum Percentage of Taxable Income Distribution to Shareholders Federal and state deferred tax asset Deferred Tax Assets, Gross Federal and state deferred tax asset, valuation allowance Deferred Tax Assets, Valuation Allowance Decrease in valuation allowance due to Tax Cuts and Jobs Act of 2017 Tax Cuts And Jobs Act of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Tax Cuts And Jobs Act of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Unrecognized tax benefits Unrecognized Tax Benefits Significant increase (decrease) in unrecognized tax benefits Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Interest or penalties relating to income taxes expensed Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Interest or penalties relating to income taxes accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Deferred leasing costs, net Deferred Costs, Leasing, Net Deferred financing costs on unsecured revolving credit facility, net Debt Issuance Costs, Line of Credit Arrangements, Net Acquired development agreements Finite Lived Intangible Asset Off Market Lease Favorable Net This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships. Ground leasehold intangible Ground Leases, Net Other, net Other Deferred Costs, Net Total amortizable other assets Other Amortizable Assets Other Amortizable Assets Straight-line rent receivable, net Deferred Rent Receivables, Net Goodwill Goodwill Cash flow hedge mark-to-market asset Interest Rate Cash Flow Hedge Asset at Fair Value Prepaid and other deferred expenses, net Prepaid Expense and Other Assets Other assets, net Schedule of Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] Schedule of Recorded Amount of Real Estate Assets Measured at Fair Value on a Nonrecurring Basis Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Total revenue Equity Method Investment, Summarized Financial Information, Revenue Total expenses Equity Method Investment Summarized Financial Information Operating Expenses Equity Method Investment, Summarized Financial Information, Operating Expenses Gain on sale of real estate Equity Method Investment Summarized Financial information, Gain (Loss) on Sale of Land Equity Method Investment Summarized Financial information, Gain (Loss) on Sale of Land Net income from continuing operations Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations Discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax [Abstract] Gain (loss) on sale of real estate Gains (Losses) on Sales of Other Real Estate Income (loss) from discontinued operations Equity Method Investment, Realized Gain (Loss) on Disposal Net income (loss) from discontinued operations Disposal Group Including Discontinued Operation Income Loss From Equity Method Investments Disposal Group, Including Discontinued Operation, Income (Loss) from Equity Method Investments Net income (loss) Equity Method Investment, Summarized Financial Information, Net Income (Loss) RPT's share of earnings from unconsolidated joint ventures Income From Equity Method Investments This item represents the entity's proportionate share for the period of the undistributed net income of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Schedule of Quarterly Results of Operations Quarterly Financial Information [Table Text Block] Statement of Cash Flows [Abstract] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net income 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 Amortization of deferred financing fees Amortization of Debt Issuance Costs and Discounts Income tax provision Earnings from unconsolidated joint ventures Distributions received from operations of unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution Loss (gain) on extinguishment of debt Other gain on unconsolidated joint ventures Gain on sale of real estate Gain (Loss) on Disposition of Assets for Financial Service Operations Amortization of premium on mortgages and notes payable, net Amortization of Debt Discount (Premium) Service-based restricted share expense Share-based Compensation Long-term incentive cash and equity compensation expense (benefit) Long Term Incentive Plan Cash Compensation Expense (Benefit) Long Term Incentive Plan Cash Compensation Expense (Benefit) Changes in assets and liabilities, net of effect of acquisitions and dispositions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Receivables Acquired lease intangibles and other assets, net Increase (Decrease) in Other Operating Assets Accounts payable, acquired lease intangibles and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisitions of real estate, net of assumed debt Payments to Acquire Real Estate Development and capital improvements Payments for Capital Improvements Net proceeds from sales of real estate Proceeds from Sale of Real Estate Held-for-investment Distributions from sale of joint venture property Proceeds from Sale of Other Real Estate Change in restricted cash Increase (Decrease) in Restricted Cash Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds on mortgages and notes payable Proceeds From Mortgages And Notes Payable Proceeds from mortgages and notes payable. Repayment of mortgages and notes payable Repayments Of Mortgages And Notes Payable Repayments of mortgages and notes payable. Proceeds on revolving credit facility Proceeds from Lines of Credit Repayments on revolving credit facility Repayments of Lines of Credit Payment of debt extinguishment costs Payment for Debt Extinguishment or Debt Prepayment Cost Payment of deferred financing costs Payments of Financing Costs Proceeds from issuance of common shares, net of costs Proceeds from (Repurchase of) Equity Repayment of capitalized lease obligation Repayments of Long-term Capital Lease Obligations Redemption of operating partnership units for cash Conversion And Redemption Of Operating Partnership Units In Shares Conversion And Redemption Of Operating Partnership Units In Shares Conversion of preferred shares Payment for Conversion of Preferred Shares Payment for Conversion of Preferred Shares Shares used for employee taxes upon vesting of awards Payments for Repurchase of Redeemable Convertible Preferred Stock Dividends paid to preferred shareholders Payments of Ordinary Dividends, Preferred Stock and Preference Stock Dividends paid to common shareholders Payments of Ordinary Dividends, Common Stock Distributions paid to operating partnership unit holders Distributions Operating Partnership Unit Holders The cash outflow distributed to Operating Partnership unit holders. Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY Supplemental Cash Flow Elements [Abstract] Assumption of debt related to acquisitions Noncash or Part Noncash Acquisition, Debt Assumed Equity investment in unconsolidated joint venture Noncash or Part Noncash Acquisition, Investments Acquired Deferred gain on real estate sold to unconsolidated joint venture Noncash or Part Noncash Divestitures, Deferred Gain on Sale of Property Noncash or Part Noncash Divestitures, Deferred Gain on Sale of Property Escrowed proceeds used in acquisition of real estate Escrow Deposit Disbursements Related to Property Acquisition SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Cash paid for interest (net of capitalized interest of $345, $743 and $1,613, respectively) Interest Paid, Net Capitalized interest Interest Paid, Capitalized SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] Reconciliation of total real estate carrying value: SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] Balance at beginning of year SEC Schedule III, Real Estate, Gross Acquisition Real Estate Acquisitions Real Estate Acquisitions Improvements SEC Schedule III, Real Estate, Improvements Cost of real estate sold/written off SEC Schedule III, Real Estate, Cost of Real Estate Sold Impairment Real Estate Impairment Real Estate, Impairment Reclassification to held for sale SEC Schedule III, Real Estate, Reclassification to Held-for-sale SEC Schedule III, Real Estate, Reclassification to Held-for-sale Balance at end of year Reconciliation of accumulated depreciation: SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] Balance at beginning of year SEC Schedule III, Real Estate Accumulated Depreciation Depreciation Expense SEC Schedule III, Real Estate Accumulated Depreciation, Depreciation Expense Cost of real estate sold/written off SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold Reclassification to held for sale SEC Schedule III, Real Estate Accumulated Depreciation, Reclassification to Held-for-sale SEC Schedule III, Real Estate Accumulated Depreciation, Reclassification to Held-for-sale Balance at end of year Aggregate cost for federal income tax purposes SEC Schedule III, Real Estate, Federal Income Tax Basis Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol 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 Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Total revenue Operating income Net income attributable to RPT Net income (loss) available to common shareholders Earnings per common share, basic (in dollars per share) Earnings per common share, diluted (in dollars per share) Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Other Joint Ventures One Other Joint Ventures One [Member] Other Joint Ventures One [Member] Investment Type [Axis] Investment Type [Axis] Investment Type Categorization [Domain] Investments [Domain] Unconsolidated joint ventures Equity Method Investments [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Kissimmee West Shopping Center Kissimmee West Shopping Center [Member] Kissimmee West Shopping Center [Member] 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] Location Real Estate Property Location Real Estate Property, Location Ownership % Equity Method Investment, Ownership Percentage JV's gross sale price of real estate property Equity Method Investment, Summarized Financial Information, Sale of Real Estate Equity Method Investment, Summarized Financial Information, Sale of Real Estate RPT proportionate share of JV's sale of real estate property Equity Method Investment, Proportionate Share of Investee, Sale of Real Estate Equity Method Investment, Proportionate Share in Joint Venture, Sale of Real Estate JV's gain on sale of real estate property Equity Method Investment, Summarized Financial Information, Gains (Losses) on Sales of Investment Real Estate Equity Method Investment, Summarized Financial Information, Gains (Losses) on Sales of Investment Real Estate RPT proportionate share on JV's gain on sale of real estate property Equity Method Investment, Proportionate Share in Joint Venture, Gains (Losses) on Sale of Investment Real Estate Equity Method Investment, Proportionate Share in Joint Venture, Gains (Losses) on Sale of Investment Real Estate Joint Venture One Joint Venture One [Member] Joint Venture One [Member] Joint Venture Two Joint Venture Two [Member] Joint Venture Two [Member] Joint Venture Three Joint Venture Three [Member] Joint Venture Three [Member] Joint Venture Four Joint Venture Four [Member] Joint Venture Four [Member] Percentage of ownership interest Number of equity investment, influence decisions Number of Equity Investment, Influence Decisions Number of Equity Investment, Influence Decisions Payments to acquire equity method investments Payments to Acquire Equity Method Investments Deferred gain on sale of investment Equity Method Investment, Deferred Gain on Sale Statement of Stockholders' Equity [Abstract] Preferred Shares Preferred Stock [Member] Common Shares Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Issuance of common shares, net of costs Stock Issued During Period, Value, New Issues Conversion and redemption of OP unit holders Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Conversion of preferred shares Stock Issued During Period, Value, Conversion of Convertible Securities Share-based compensation and other expense, net of shares withheld for employee taxes Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Dividends declared to common shareholders Dividends, Common Stock, Cash Dividends declared to preferred shareholders Dividends, Preferred Stock, Cash Distributions declared to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Dividends declared to deferred shares Restricted Share Units Unvested Dividends Paid This element represents dividends paid during the period pertaining to unvested restricted shares that were previously awarded under a share-based compensation plan. Other comprehensive income (loss) adjustment Net income Ending Balance Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Unsecured Debt Unsecured Debt [Member] Unsecured Debt, Tranches One Unsecured Debt, Tranche One [Member] Unsecured Debt, Tranche One [Member] Unsecured Debt, Tranches Two Unsecured Debt, Tranche Two [Member] Unsecured Debt, Tranche Two [Member] Unsecured Debt, Tranche Three Unsecured Debt, Tranche Three [Member] Unsecured Debt, Tranche Three [Member] Fixed Rate Mortgages Fixed Rate Mortgage Debt [Member] Fixed Rate Mortgage Debt [Member] Junior Subordinated Notes Junior Subordinated Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Unsecured Notes in Private Placement Offering Senior Unsecured Notes in Private Placement Offering [Member] Senior Unsecured Notes in Private Placement Offering [Member] Unsecured Term Loan Due 2021 Unsecured Term Loan Maturing 2021 [Member] Unsecured Term Loan Maturing 2021 [Member] Senior Unsecured Notes and Unsecured Term Loans Senior Unsecured Notes and Unsecured Term Loans [Member] Senior Unsecured Notes and Unsecured Term Loans [Member] Master Loan Agreement Master Loan Agreement [Member] Master Loan Agreement [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Market Plaza Market Plaza [Member] Market Plaza [Member] Jackson Crossing Jackson Crossing [Member] Jackson Crossing [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Proceeds from issuance of senior unsecured notes in private placement offering Proceeds from Issuance of Unsecured Debt Debt term Debt Instrument, Term Repaid mortgage notes, weighted average interest rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Number of mortgages repaid Mortgage Loans on Real Estate, Number of Loans Repaid Mortgage Loans on Real Estate, Number of Loans Repaid Unsecured term loan Debt Instrument, Face Amount Reduced loan interest rate, basis points Debt Instrument, Interest Rate, Increase (Decrease) Senior unsecured notes and unsecured term loans Long-term Debt, Gross Fixed interest rate Debt Instrument, Interest Rate, Stated Percentage Extinguishment of debt, amount Repayments of Debt Net book value of mortgages on properties Mortgage Loans on Real Estate, Carrying Amount of Mortgages Number of mortgages maturing in 2018 Long-Term Debt, Maturities, Number of Instruments Maturing in Next Twelve Months Long-Term Debt, Maturities, Number of Instruments Maturing in Next Twelve Months Number of mortgages maturing in 2019 Long-Term Debt, Maturities, Number of Instruments Maturing in Year Two Long-Term Debt, Maturities, Number of Instruments Maturing in Year Two Mortgages maturing in 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two Unsecured revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity Total extension term Debt Instrument, Extension Term Total Debt Instrument, Extension Term Total Number of extension options Debt Instrument, Number Of Extension Options Debt Instrument, Number Of Extension Options Extension term Debt Instrument, Extension Term Debt Instrument, Extension Term Revolving credit facility spread above LIBOR (as a percentage) Debt Instrument, Basis Spread on Variable Rate Line of credit facility increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Borrowings on unsecured revolving credit facility, net of repayments Proceeds from (Repayments of) Lines of Credit Letters of credit outstanding Letters of Credit Outstanding, Amount Unsecured revolving credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Unsecured revolving credit facility, variable interest rate Debt, Weighted Average Interest Rate Debt Instrument, Interest Rate, Effective Percentage Debt Instrument, Interest Rate, Effective Percentage Capital lease assets, gross Capital Leased Assets, Gross Capital ground lease, amount expensed as interest Capital Leases, Income Statement, Interest Expense Schedule of Land Held for Development Schedule of Real Estate Properties [Table Text Block] Long Term Incentive Plans Long Term Incentive Plans [Member] Long Term Incentive Plans Service And Performancebased Stock Options Service And Performancebased Stock Options [Member] Service and performance-based stock options Trustee Service And Performancebased Stock Options Trustee Service And Performancebased Stock Options [Member] Trustee Service And Performancebased Stock Options [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Number of share-based compensation plans in effect Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Number of shares authorized for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of shares available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based compensation expense Allocated Share-based Compensation Expense Stock awards vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Expense related to restricted share grants Restricted Stock or Unit Expense Performance-based liability awards, measurement period Share Based Compensation Arrangement By Share Based Payment Award Performance Period Share Based Compensation Arrangement by Share Based Payment Award, Performance Period Percentage of award to be paid in cash Percentage Of Award Paid In Cash Percentage Of Award Paid In Cash Compensation expense (benefit) related to cash based award grant Compensation Expense (Benefit) Related To Cash Based Award Grant Compensation Expense (Benefit) Related To Cash Based Award Grant Total unrecognized compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Total unrecognized compensation expense, weighted average period of recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Defined contribution plan expense Defined Contribution Plan, Cost Level 3 Fair Value, Inputs, Level 3 [Member] Deposits paid Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Paid Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Paid Escrowed proceeds from dispositions Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Escrowed Proceeds from Dispositions Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Escrowed Proceeds from Dispositions Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Total consolidated income producing acquisitions Income Producing Property Acquisitions [Member] Income Producing Property Acquisitions Consolidated revenue Business Acquisition, Pro Forma Revenue Consolidated net income available to common shareholders Business Acquisition, Pro Forma Net Income (Loss) Equity [Abstract] Common shares dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Common shares dividends paid (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Preferred shares dividends declared (in dollars per share) Preferred Stock, Dividends Per Share, Declared Preferred shares dividends paid (in dollars per share) Preferred Stock, Dividends, Per Share, Cash Paid Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Diluted EPS Diluted Shares [Member] Diluted Shares [Member] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Net income Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net (income) attributable to noncontrolling interest Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Allocation of income to restricted share awards Income Loss From Continuing Operations Allocable To Non Vested Restricted Shares Income Loss From Continuing Operations Allocable To Non Vested Restricted Shares Weighted average shares outstanding, Basic (in shares) Stock options and restricted share awards using the treasury method (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average shares outstanding, Diluted (in shares) Earnings per common share, Diluted (in dollars per share) Noncontrolling interest, exchange ratio for Company common stock Noncontrolling interest, Exchange Ratio for Company Common Stock Noncontrolling interest, Exchange Ratio for Company Common Stock Straight-line rent receivables Allowance For Doubtful Deferred Rent Receivables Allowance for Doubtful Deferred Rent Receivables Remaining weighted-average amortization period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Amortization of intangible assets Amortization of Intangible Assets Other assets and acquired lease intangibles, net, subject to amortization Other Assets and Acquired Lease Intangibles, Subject to Amortization Other Assets and Acquired Lease Intangibles, Subject to Amortization Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Interest rate contracts - assets Derivative Financial Instruments, Assets [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Interest rate contracts - liabilities Derivative Financial Instruments, Liabilities [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense Interest Expense [Member] Interest Rate Contract Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Amount of Gain Recognized in OCI on Derivative Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Amount of Loss Reclassified from Accumulated OCI into Income Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Summary of Activity of Service Based Restricted Shares under LTIP Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Stock Option Activity for All Plans Share-based Compensation, Stock Options, Activity [Table Text Block] Leases [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Other Assets, Net and Acquired Lease Intangible Assets, Net Other Assets Disclosure [Text Block] Unsecured Revolving Credit Facility Unsecured Revolving Credit Facility [Member] Unsecured Revolving Credit Facility Principal Payments Mortgage Loans on Real Estate [Abstract] 2018 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2019 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Subtotal debt Unamortized mortgage premium Debt Instrument, Unamortized Premium Unamortized deferred financing costs Debt Issuance Costs, Net Total Capital Lease Payments Capital Lease Obligations [Abstract] 2018 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2019 Capital Leases, Future Minimum Payments Due in Two Years 2020 Capital Leases, Future Minimum Payments Due in Three Years 2021 Capital Leases, Future Minimum Payments Due in Four Years 2022 Capital Leases, Future Minimum Payments Due in Five Years Thereafter Capital Leases, Future Minimum Payments Due Thereafter Subtotal debt Capital Leases, Future Minimum Payments Due Amounts representing interest Capital Leases, Future Minimum Payments, Interest Included in Payments Total Capital Leases, Future Minimum Payments, Net Minimum Payments Basis of Presentation [Table] Basis Of Presentation [Table] Basis of Presentation [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Michigan MICHIGAN Florida FLORIDA Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Annualized base rent Annualized Base Rent [Member] Annualized Base Rent [Member] Shopping centers Shopping Centers [Member] Shopping Centers Land available for sale Revision Of Certain Special Assessment Obligations On Undeveloped Land Revision Of Certain Special Assessment Obligations On Undeveloped Land [Member] Revision Of Certain Special Assessment Obligations On Undeveloped Land [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] Buildings and improvements Building [Member] Parking lot surfacing and equipment Equipment [Member] Other capitalized property plant and equipment Other Capitalized Property Plant and Equipment [Member] Basis of Presentation [Line Items] Basis Of Presentation [Line Items] Basis of Presentation [Line Items] Number of metropolitan markets in which entity operates Number of Metropolitan Markets in which Entity Operates Number of Metropolitan Markets in which Entity Operates Number of real estate properties Number of Real Estate Properties Area of an real estate property Area Occupied Area Occupied Number Of equity investment Number Of Equity Investment Number of Equity Investment Number of joint ventures with real estate properties Number of Joint Ventures With Real Estate Properties Number of Joint Ventures With Real Estate Properties Number of joint ventures without real estate properties Number of Joint Ventures Without Real Estate Properties Number of Joint Ventures Without Real Estate Properties Concentration risk, percentage Concentration Risk, Percentage Ownership interest in Ramco-Gershenson Properties, L. P. Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Non-voting and voting common stock, percentage of ownership Percentage Of Ownership Interest In Subsidiaries Percentage Of Ownership Interest in Subsidiaries Allowances for doubtful accounts receivable Allowance for Doubtful Accounts Receivable Allowance for straight line rent Allowance on Straight Line Rent Allowance on Straight Line Rent Straight-line rent receivable, net Straight Line Rent Income Receivables Straight Line Rent Income Receivables Property plant and equipment, estimated useful lives Property, Plant and Equipment, Useful Life Maximum period project is not depreciated following completion Construction in Progress, Maximum Period Project is not Depreciated Following Completion Construction in Progress, Maximum Period Project is not Depreciated Following Completion Maximum period indirect project costs associated with construction are capitalized Construction in Progress, Maximum Period Indirect Project Costs Associated with Construction are Capitalized Construction in Progress, Maximum Period Indirect Project Costs Associated with Construction are Capitalized Provision for impairment Percentage of ownership Percentage Of Ownership Percentage Of Ownership Impairment on equity method investments Equity Method Investment, Other than Temporary Impairment Deferred financing costs, net Amount in excess of the FDIC insured limit Amount In Excess For Reimbursement By Federal Deposit Insurance Corporation Amount In Excess For Reimbursement By Federal Deposit Insurance Corporation Number of equity investment, non variable interest entity Number of Equity Investment, Non Variable Interest Entity Number of Equity Investment, Non Variable Interest Entity Number of reportable segment individual properties aggregated Number of Reportable Segments Front Range Village Front Range Village [Member] Front Range Village [Member] Buttermilk Town Center Buttermilk Towne Center [Member] Buttermilk Towne Center [Member] Public improvement agreement net Other Assets, Public Improvement Fee, Net Other Assets, Public Improvement Fee, Net Real estate tax exemption, net Other Assets, Real Estate Tax Exemption, Net Other Assets, Real Estate Tax Exemption, Net Schedule of Other Assets Schedule of Other Assets [Table Text Block] Schedule of Acquired Lease Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Estimated Aggregate Amortization Expense Related to Other Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Fair Value Fair Value Disclosures [Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Leases Operating Leases Of Lessor And Lessee Disclosure [Text Block] The entire disclosure for operating leases whereby the entity is either the lessor or the lessee. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Corporate Headquarters Corporate Headquarters [Member] Corporate Headquarters Ground Lease Ground Lease [Member] Ground Lease Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating lease, expiration year Initial Lease Term Expiration Year Initial Lease Term Expiration Year Rent expense Operating Leases, Rent Expense Dividends Payable [Table] Dividends Payable [Table] Dividends [Axis] Dividends [Axis] Dividends [Domain] Dividends [Domain] Ordinary dividend Ordinary Dividends [Member] Ordinary Dividends [Member] Capital gain distribution Capital Gain Distribution [Member] Capital Gain Distribution [Member] Non-dividend distribution Non-Dividend Distribution [Member] Non-Dividend Distribution [Member] Dividends Payable [Line Items] Dividends Payable [Line Items] Common shares dividends declared for income tax purposes (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid For Income Tax Purposes Common Stock, Dividends, Per Share, Cash Paid For Income Tax Purposes Preferred shares dividends paid for income tax purposes (in dollars per share) Preferred Stock, Dividends, Per Share, Cash Paid For Income Tax Purposes Preferred Stock, Dividends, Per Share, Cash Paid For Income Tax Purposes Share-Based Compensation and Other Benefit Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] SUMMARY OF REAL ESTATE AND ACCUMULATED DEPRECIATION SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Text Block] Liberty Square Liberty Square [Member] Liberty Square [Member] Rolling Meadows Rolling Meadows [Member] Rolling Meadows [Member] Village Plaza Village Plaza [Member] Village Plaza [Member] Hoover Eleven Hoover Eleven [Member] Hoover Eleven [Member] Auburn Mile - Aqua Tots Auburn Mile - Aqua Tots [Member] Auburn Mile - Aqua Tots [Member] New Towne Plaza New Towne Plaza [Member] New Towne Plaza [Member] Clinton Valley Clinton Valley [Member] Clinton Valley [Member] Roseville Towne Center Roseville Towne Center [Member] Roseville Towne Center [Member] Gaines Marketplace Gaines Marketplace [Member] Gaines Marketplace [Member] Walgreen's Data Center Walgreen's Data Center [Member] Walgreen's Data Center [Member] Auburn Mile Auburn Mile [Member] Auburn Mile [Member] Oak Brook Square Oak Brook Square [Member] Oak Brook Square [Member] Holcomb Roswell - Outparcel Holcomb Roswell - Outparcel [Member] Holcomb Roswell - Outparcel [Member] River City Marketplace - Outparcel River City Marketplace - Outparcel [Member] River City Marketplace - Outparcel [Member] Hartland - Outparcel Hartland - Outparcel [Member] Hartland - Outparcel [Member] River City Marketplace River City Marketplace [Member] River City Marketplace [Member] Lakeland Park Center - Outparcel Lakeland Park Center - Outparcel [Member] Lakeland Park Center - Outparcel [Member] Shoppes at Fairlane Meadows Shoppes at Fairlane Meadows [Member] Shoppes at Fairlane Meadows [Member] Livonia Plaza Livonia Plaza [Member] Livonia Plaza [Member] Lakeshore Marketplace Lakeshore Marketplace [Member] Lakeshore Marketplace [Member] River Crossing Centre River Crossing Centre [Member] River Crossing Centre [Member] Centre at Woodstock Centre at Woodstock [Member] Centre at Woodstock [Member] Troy Towne Center Troy Towne Center [Member] Troy Towne Center [Member] Harvest Junction LLC - Outparcel Harvest Junction LLC - Outparcel [Member] Harvest Junction LLC - Outparcel [Member] Conyers Crossing - Chipotle Outparcel Conyers Crossing - Chipotle Outparcel [Member] Conyers Crossing - Chipotle Outparcel [Member] Lakeshore Marketplace - Outparcel Lakeshore Marketplace - Outparcel [Member] Lakeshore Marketplace - Outparcel [Member] The Towne Center at Aquia - Outparcel The Towne Center at Aquia - Outparcel [Member] The Towne Center at Aquia - Outparcel [Member] Consolidated / outparcel dispositions Land And Outparcel Dispositions [Member] Land and Outparcel Dispositions Income producing property and land and outparcel disposition Income Producing Property and Land and Outparcel Dispositions [Member] Income Producing Property and Land and Outparcel Dispositions [Member] Real Estate Assets Gross Purchase Price Acreage Area of Land Date Acquired Real Estate Property Date Sold Real Estate Property, Date Sold Purchase Price Real Estate Assets Gross Sales Price Real Estate Assets Gross Sales Price Gain (loss) on Sale Gain (Loss) on Disposition of Assets Debt Debt Disclosure [Text Block] Senior unsecured notes Unsecured Debt Unsecured term loan facilities Other Long-term Debt Fixed rate mortgages Unsecured revolving credit facility Long-term Line of Credit Junior subordinated notes Junior Subordinated Notes Unamortized premium Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Taxes Income Tax Disclosure [Text Block] Approximate Future Minimum Revenues from Rentals under Non-cancelable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Operating Leases, Future Minimum Payments Receivable [Abstract] Operating Leases, Future Minimum Payments Receivable [Abstract] 2018 Operating Leases, Future Minimum Payments Receivable, Current 2019 Operating Leases, Future Minimum Payments Receivable, in Two Years 2020 Operating Leases, Future Minimum Payments Receivable, in Three Years 2021 Operating Leases, Future Minimum Payments Receivable, in Four Years 2022 Operating Leases, Future Minimum Payments Receivable, in Five Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Total Operating Leases, Future Minimum Payments Receivable Interest Rate Swap Number of interest rate swap agreements Derivative, Number of Instruments Held Aggregate national value Derivative, Notional Amount Aggregate notional value, derivative asset Aggregate notional amount, derivative liability Commitments and Contingencies Disclosure [Abstract] Construction costs related to development and expansion Long-term Purchase Commitment, Amount Impairment Provisions Asset Impairment Charges [Text Block] Summary of Notional Values and Fair Values of Derivative Financial Instruments Summary Of Hedged Financial Instruments Disclosure [Table Text Block] Summary Of Hedged Financial Instruments Disclosure [Table Text Block] Summary of Effect of Derivative Financial Instruments on Condensed Consolidated Statements of Operations Derivative Instruments, Gain (Loss) [Table Text Block] Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule III, Real Estate and Accumulated Depreciation, by Property [Table] Period [Axis] Period [Axis] Period [Axis] Period [Domain] Period [Domain] Period [Domain] Period One Period One [Member] Period 1 [Member] Period Two Period Two [Member] Period 2 [Member] Period Three Period Three [Member] Period Three [Member] Bridgewater Falls Bridgewater Falls [Member] Bridgewater Falls [Member] Buttermilk Towne Center Centennial Shops Centennial Shops [Member] Centennial Shops [Member] Central Plaza Central Plaza [Member] Central Plaza [Member] Clinton Pointe Clinton Pointe [Member] Clinton Pointe [Member] Coral Creek Shops Coral Creek Shops [Member] Coral Creek Shops [Member] Crofton Centre Crofton Centre [Member] Crofton Centre [Member] Crossroads Centre Crossroads Centre [Member] Crossroads Centre [Member] Cypress Point Cypress Point [Member] Cypress Point [Member] Deer Creek Shopping Center Deer Creek [Member] Deer Creek [Member] Deer Grove Centre Deer Grove Centre [Member] Deer Grove Centre [Member] Deerfield Towne Center Deerfield Towne Center [Member] Deerfield Towne Center [Member] East Town Plaza East Town Plaza [Member] East Town Plaza [Member] Harvest Junction North Harvest Junction North [Member] Harvest Junction North [Member] Harvest Junction South Harvest Junction South [Member] Harvest Junction South [Member] Heritage Place Heritage Place [Member] Heritage Place [Member] Holcomb Center Holcomb Center [Member] Holcomb Center [Member] Hunters Square Hunters Square [Member] Hunters Square [Member] Jackson West Jackson West [Member] Jackson West [Member] Lakeland Park Center Lakeland Park Center [Member] Lakeland Park Center [Member] Marketplace of Delray Marketplace of Delray [Member] Marketplace of Delray [Member] Merchants' Square Merchants Square [Member] Merchants' Square [Member] Mission Bay Mission Bay [Member] Mission Bay [Member] Mount Prospect Plaza Mount Prospect Plaza [Member] Mount Prospect Plaza [Member] Nagawaukee Shopping Center Nagawaukee Shopping Center [Member] Nagawaukee Shopping Center [Member] Olentangy Plaza Olentangy Plaza [Member] Olentangy Plaza [Member] Parkway Shops Parkway Shops [Member] Parkway Shops [Member] Peachtree Hill Peachtree Hill [Member] Peachtree Hill [Member] Promenade at Pleasant Hill Promenade At Pleasant Hill [Member] Promenade at Pleasant Hill [Member] Providence Marketplace Providence Marketplace [Member] Providence Marketplace [Member] Rivertowne Square Rivertowne Square [Member] Rivertowne Square [Member] Rossford Pointe Rossford Pointe [Member] Rossford Pointe [Member] Shoppes of Lakeland Shoppes Of Lakeland [Member] Shoppes of Lakeland [Member] Shops at Old Orchard Shops at Old Orchard [Member] Shops at Old Orchard [Member] Southfield Plaza Southfield Plaza [Member] Southfield Plaza [Member] Spring Meadows Place Spring Meadows Place [Member] Spring Meadows Place [Member] Tel-Twelve Tel Twelve [Member] Tel-Twelve [Member] The Crossroads Crossroads [Member] Crossroads [Member] The Shoppes at Fox River The Shoppes At Fox River [Member] The Shoppes at Fox River [Member] The Shops on Lane Avenue The Shops on Lane Avenue [Member] The Shops on Lane Avenue [Member] Town & Country Crossing Town And Country Crossing [Member] Town and Country Crossing [Member] Treasure Coast Commons Treasure Coast Commons [Member] Treasure Coast Commons [Member] Troy Marketplace Troy Marketplace [Member] Troy Marketplace [Member] Troy Marketplace II Troy Marketplace II [Member] Troy Marketplace II [Member] Village Lakes Shopping Center Village Lakes Shopping Center [Member] Village Lakes Shopping Center [Member] Vista Plaza Vista Plaza [Member] Vista Plaza [Member] Webster Place Webster Place [Member] Webster Place [Member] West Broward West Broward [Member] West Broward [Member] West Allis Towne Centre West Allis Towne Centre [Member] West Allis Towne Centre [Member] West Oaks I West Oaks I [Member] West Oaks I [Member] West Oaks II West Oaks I I [Member] West Oaks II [Member] Winchester Center Winchester Center [Member] Winchester Center [Member] Woodbury Lakes Woodbury Lakes [Member] Woodbury Lakes [Member] Land Held for Future Development Land Held For Development [Member] Land Held for Development Real Estate and Accumulated Depreciation [Line Items] SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] Encumbrances SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances Initial Cost to Company, Land SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land Initial Cost to Company, Building & Improvements SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements Capitalized Subsequent to Acquisition or Improvements, Net of Impairments SEC Schedule III, Real Estate and Accumulated