220 Central Park South (220 CPS) (Narrative) (Details) $ in Thousands	3 Months Ended		42 Months Ended
	Mar. 31, 2022 USD ($) unit	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) unit
Real Estate [Line Items]
Income tax expense	$ 7,411	$ 1,984
220 Central Park South
Real Estate [Line Items]
Number of condominium units sold (unit) | unit	1		107
Cash proceeds from the sale of real estate	$ 15,095		$ 3,021,991
Net gain on sale of real estate	6,001		$ 1,123,256
Income tax expense	$ 589