Impairment Losses, Transaction Related Costs and Other (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Transaction Related Costs, Impairment Losses and Other [Line Items]
Real estate impairment losses	$ (7,880)	$ (236,286)	$ (8,065)
Transaction related costs	(5,935)	(8,001)	(4,613)
Impairment losses and transaction related costs, net	(13,815)	(174,027)	(106,538)
608 Fifth Avenue
Transaction Related Costs, Impairment Losses and Other [Line Items]
608 Fifth Avenue lease liability extinguishment gain in 2020 and impairment loss and related write-offs in 2019	$ 0	$ 70,260	$ (93,860)