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

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The cash inflow from the sale of real estate held-for-investment and real estate joint ventures.

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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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Investments in Partnerships - Dispositions (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2019	Feb. 28, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains (losses) on sales of investment real estate			$ 1,513	$ 748	$ 1,513	$ 748
Partnership Interest
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage	25.00%
Undeveloped Land Parcel Adjacent To Gloucester Premium Outlets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains (losses) on sales of investment real estate	$ 600
Undeveloped Land Parcel Adjacent To Gloucester Premium Outlets \| Partnership Interest
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from real estate and real estate joint ventures	3,800
Gains (losses) on sales of investment real estate	$ 2,300
Condominium Interest in 907 Market Street, Philadelphia, Pennsylvania
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains (losses) on sales of investment real estate		$ 2,800
Condominium Interest in 907 Market Street, Philadelphia, Pennsylvania \| Partnership Interest
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage		50.00%
Proceeds from real estate and real estate joint ventures		$ 41,800
Gains (losses) on sales of investment real estate		5,500
Proceeds from sale of real estate		$ 19,700