Segment Information (Reconciliation of Net Income to NOI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting [Abstract]
Net (loss) income	$ 207,553	$ (461,845)	$ 3,334,262
Depreciation and amortization expense	412,347	399,695	419,107
General and administrative expense	134,545	181,509	169,920
Impairment losses, transaction related costs and other	13,815	174,027	106,538
(Income) loss from partially owned entities	(130,517)	329,112	(78,865)
(Income) loss from real estate fund investments	(11,066)	226,327	104,082
Interest and other investment (income) loss, net	(4,612)	5,499	(21,819)
Interest and debt expense	231,096	229,251	286,623
Net gain on transfer to Fifth Avenue and Times Square JV	0	0	(2,571,099)
Net gains on disposition of wholly owned and partially owned assets	(50,770)	(381,320)	(845,499)
Income tax (benefit) expense	(10,496)	36,630	103,439
Loss from discontinued operations	0	0	30
NOI from partially owned entities	310,858	306,495	322,390
NOI attributable to noncontrolling interests in consolidated subsidiaries	(69,385)	(72,801)	(69,332)
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