220 Central Park South (220 CPS) (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		45 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) unit	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) unit
Real Estate [Line Items]
Income tax expense	$ 3,564	$ 2,841	$ 10,975	$ 4,825
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			$ 16,124		$ 3,023,020
Net gain on sale of real estate			7,030		$ 1,124,285
Income tax expense			$ 945