Investments in Partially Owned Entities (Management, Development, Leasing and Other Agreements for Fifth Avenue and Times Square JV) (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Apr. 18, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 21, 2022
Schedule of Equity Method Investments [Line Items]
Net gains on disposition of wholly owned and partially owned assets			$ 100,625	$ 50,770	$ 381,320
BMS cleaning fees
Schedule of Equity Method Investments [Line Items]
Fee income recognized by equity method investees for building maintenance services			4,601	4,234	3,613
Majority-Owned Subsidiary, Unconsolidated | Property Management Fee
Schedule of Equity Method Investments [Line Items]
Revenue from related parties			$ 4,397	4,297	3,982
Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Property management fee agreement percentage of income			2.00%
Development fee percent			5.00%
Supervisory fee, percent			1.50%
Net gains on disposition of wholly owned and partially owned assets	$ 13,613
Non recourse loan, amount						$ 450,000
Property level funds applied by lenders		$ 29,000
Balance principal amount		$ 421,000	$ 421,000
Percentage bearing variable interest		8.50%	8.50%
Fifth Avenue and Times Square JV | Prime Rate
Schedule of Equity Method Investments [Line Items]
Percentage bearing variable interest		1.00%	1.00%
Fifth Avenue and Times Square JV | BMS cleaning fees
Schedule of Equity Method Investments [Line Items]
Fee income recognized by equity method investees for building maintenance services			$ 4,571	$ 3,993	$ 3,595