Investments in Partially Owned Entities (Management, Development, Leasing and Other Agreements for Fifth Avenue and Times Square JV) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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%
BMS cleaning fees
Schedule of Equity Method Investments [Line Items]
Fee income recognized by equity method investees for building maintenance services	$ 4,234	$ 3,613	$ 3,613
BMS cleaning fees | Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Fee income recognized by equity method investees for building maintenance services	3,993	3,595	3,087
Property Management Fee | Majority-Owned Subsidiary, Unconsolidated
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	$ 4,297	$ 3,982	$ 3,085