Investments in Partially Owned Entities (50-70 West 93rd Street) (Details) - USD ($) $ in Thousands		6 Months Ended
	May 13, 2024	Jun. 30, 2024	Jun. 30, 2023
Schedule Of Equity Method Investments
Proceeds from sale of condominium units at 220 Central Park South		$ 31,605	$ 14,216
Residential Building | 50-70 West 93rd Street
Schedule Of Equity Method Investments
Ownership percentage	49.90%
Proceeds from sale of condominium units at 220 Central Park South	$ 2,000
Net gain on sale of land	873
Residential Building | 50-70 West 93rd Street | Participating Mortgages
Schedule Of Equity Method Investments
Debt amount	$ 83,500