The number of properties disposed of during a period.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Net increase or decrease in the carrying amount of the debt instrument for the period.

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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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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