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Note 3 - Operating Property Activities (Details Textual) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Payments to Acquire Real Estate, Total |  |  |  | $ 3,337,000 | $ 56,036,000 |  |
Equity Method Investments |  | $ 568,698,000 |  | 568,698,000 |  |  | $ 483,861,000
Impairment of Real Estate |  |  |  | 30,500,000 | 31,300,000 |  |
Mortgage Loans Held-for-sale Reclassified to Other Liabilities |  |  |  | 3,100,000 |  |  |
Asset Impairment Charges, Total |  | $ 22,873,000 | $ 29,719,000 | 30,519,000 | $ 31,336,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  | 4,700,000 |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  |  | 2,100,000 |  |  |
Asset Impairment Charges, Total |  |  |  | $ 9,900,000 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |
Number of Properties Held-for-Sale |  | 3 |  | 3 |  |  |
Real Estate Held-for-sale |  | $ 10,200,000 |  | $ 10,200,000 |  |  |
Real Estate Owned, Accumulated Depreciation |  | 4,800,000 |  | 4,800,000 |  |  |
Impairment of Real Estate |  |  |  | 300,000 |  |  |
Disposal Group, Expected to Market for Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |
Asset Impairment Charges, Total |  |  |  | 20,600,000 |  |  |
Investment in Unconsolidated Property, Unconsolidated 2017 [Member] |  |  |  |  |  |  |
Equity Method Investments |  | $ 62,400,000 |  | $ 62,400,000 |  | $ 62,400,000 |
Equity Method Investment, Ownership Percentage |  | 54.80% |  | 54.80% |  |  |
Gain on Sale of Operating Properties/ Change in Controls of Interests [Member] | Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |
Deconsolidation, Gain (Loss), Amount |  |  |  | $ 6,800,000 |  |  |
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member] |  |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  |  | 206,000,000 |  |  |
Sold Portion of Investment in Consolidated Operating Property [Member] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 320,000,000 |  | 320,000,000 |  |  |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  | $ 43,800,000 |  |  |
Land Parcel Adjacent to Shopping Center Located in Ardmore, PA [Member] |  |  |  |  |  |  |
Payments to Acquire Real Estate, Total | $ 3,400,000 |  |  |  |  |  |
Consolidated Operating Properties [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |
Number of Properties Disposed of |  |  |  | 5 |  |  |

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