- Schedule of Lease Liability Extinguishment Gain (Transaction Related Costs and Impairment Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Transaction Related Costs, Impairment Losses and Lease Termination Gain [Line Items]
Transaction related costs	$ (1,039)	$ (230)	$ (1,110)	$ (379)
608 Fifth Avenue non-cash lease liability extinguishment impairment loss	0	(7,500)	0	(7,500)
Transaction related costs, impairment losses and other	69,221	(101,590)	69,150	(101,739)
608 Fifth Avenue
Transaction Related Costs, Impairment Losses and Lease Termination Gain [Line Items]
608 Fifth Avenue non-cash lease liability extinguishment gain	$ 70,260	$ (93,860)	$ 70,260	$ (93,860)