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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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The value of mortgage loans held-for-sale that was reclassified to other liabilities.

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