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Investments in Unconsolidated Joint Ventures - Balance Sheet footnotes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments
Assets	$ 8,412,226		$ 8,412,226		$ 9,184,005
Liabilities	5,177,435		5,177,435		6,738,745
Joint Venture
Schedule of Equity Method Investments
Amortization of difference between cost of investments and book value of underlying equity	2,768	$ 3,361	7,431	$ 11,089
Joint Venture | PPR Portfolio | PPR Portfolio
Schedule of Equity Method Investments
Assets	2,804,711		2,804,711		2,857,757
Liabilities	$ 1,671,469		$ 1,671,469		$ 1,687,042

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