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Note 3 - Operating Property Activities (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Payments to Acquire Real Estate, Total |  |  | $ 3,337 | $ 38,390 |
Equity Method Investments | $ 560,068 |  | 560,068 |  | $ 483,861
Asset Impairment Charges, Total |  |  | 7,646 | $ 1,617 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  | 2,900 |  |
Gains (Losses) on Sales of Investment Real Estate |  |  | 500 |  |
Asset Impairment Charges, Total |  |  | 2,400 |  |
Disposal Group, Expected to Market for Sale, Not Discontinued Operations [Member] |  |  |  |  |
Asset Impairment Charges, Total |  |  | 5,200 |  |
Investment in Unconsolidated Property, Unconsolidated 2017 [Member] |  |  |  |  |
Equity Method Investments | $ 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 |  | $ 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 Parcel Adjacent to Shopping Center Located in Ardmore, PA [Member] |  |  |  |  |
Payments to Acquire Real Estate, Total |  | $ 3,400 |  |  |
Consolidated Operating Properties [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |
Number of Properties Disposed of |  |  | 4 |  |

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