Segment Information (Summary of NOI by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 1,589,210	$ 1,527,951	$ 1,924,700
Operating expenses	(797,315)	(789,066)	(917,981)
NOI - consolidated	791,895	738,885	1,006,719
Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries	(69,385)	(72,801)	(69,332)
Add: NOI from partially owned entities	310,858	306,495	322,390
NOI at share	1,033,368	972,579	1,259,777
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net and other	1,318	46,246	(6,060)
NOI at share - cash basis	1,034,686	1,018,825	1,253,717
Balance Sheet Data:
Real estate, at cost	13,217,845	12,087,943	13,074,012	$ 16,237,883
Investments in partially owned entities	3,297,389	3,491,107
Assets	17,266,588	16,221,822
New York
Segment Reporting Information [Line Items]
Total revenues	1,257,599	1,221,748	1,577,860
Operating expenses	(626,386)	(640,531)	(758,304)
NOI - consolidated	631,213	581,217	819,556
Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries	(38,980)	(43,773)	(40,896)
Add: NOI from partially owned entities	300,721	296,447	294,168
NOI at share	892,954	833,891	1,072,828
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net and other	(1,188)	36,715	(12,318)
NOI at share - cash basis	891,766	870,606	1,060,510
Balance Sheet Data:
Real estate, at cost	10,702,008	9,581,830
Investments in partially owned entities	3,265,933	3,459,142
Assets	15,969,498	15,046,469
Other
Segment Reporting Information [Line Items]
Total revenues	331,611	306,203	346,840
Operating expenses	(170,929)	(148,535)	(159,677)
NOI - consolidated	160,682	157,668	187,163
Deduct: NOI attributable to noncontrolling interests in consolidated subsidiaries	(30,405)	(29,028)	(28,436)
Add: NOI from partially owned entities	10,137	10,048	28,222
NOI at share	140,414	138,688	186,949
Non-cash adjustments for straight-line rents, amortization of acquired below-market leases, net and other	2,506	9,531	6,258
NOI at share - cash basis	142,920	148,219	$ 193,207
Balance Sheet Data:
Real estate, at cost	2,515,837	2,506,113
Investments in partially owned entities	31,456	31,965
Assets	$ 1,297,090	$ 1,175,353