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Note 3 - Operating Property Activities (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Payments to Acquire Real Estate, Total |  |  | $ 5,407 | $ 110,802 |  |
Equity Method Investments | $ 580,737 |  | 580,737 |  |  | $ 483,861
Impairment of Real Estate |  |  | 33,900 | 34,300 |  |
Asset Impairment Charges, Total | $ 3,336 | $ 2,944 | 33,855 | $ 34,280 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  | 9,700 |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  | $ 6,300 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Number of Properties Held-for-Sale | 1 |  | 1 |  |  |
Real Estate Held-for-sale | $ 31,200 |  | $ 31,200 |  |  |
Real Estate Owned, Accumulated Depreciation | 9,300 |  | 9,300 |  |  |
Asset Impairment Charges, Total |  |  | 16,300 |  |  |
Disposal Group, Expected to Market for Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Asset Impairment Charges, Total |  |  | 17,600 |  |  |
Investment in Unconsolidated Property, Unconsolidated 2017 [Member] |  |  |  |  |  |
Equity Method Investments | $ 62,400 |  | $ 62,400 |  | $ 62,400 |
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 |  |  |
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member] |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  | 206,000 |  |  |
Sold Portion of Investment in Consolidated Operating Property [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 320,000 |  | 320,000 |  |  |
Noncontrolling Interest, Decrease from Deconsolidation |  |  | $ 43,800 |  |  |
Land Parcels Adjacent to Shopping Center Located in Ardmore, PA and Elmont, NY [Member] |  |  |  |  |  |
Number of Land Parcels Acquired |  |  | 2 |  |  |
Payments to Acquire Real Estate, Total |  |  | $ 5,400 |  |  |
Consolidated Operating Properties [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Number of Properties Disposed of |  |  | 10 |  |  |

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