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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Assets	$ 8,643,452		$ 8,643,452		$ 9,184,005
Liabilities	5,516,506		5,516,506		6,738,745
Joint Venture
Schedule of Equity Method Investments [Line Items]
Amortization of difference between cost of investments and book value of underlying equity	2,420	$ 3,729	4,663	$ 7,728
Joint Venture | PPR Portfolio | PPR Portfolio
Schedule of Equity Method Investments [Line Items]
Assets	2,821,851		2,821,851		2,857,757
Liabilities	$ 1,673,662		$ 1,673,662		$ 1,687,042

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