Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Commercial real estate property, net		$ 5,399,002	$ 6,724,007
Cash and restricted cash		266,059	166,070	$ 129,475
Tenant and other receivables, related party receivables, and deferred rents receivable		44,507	43,968
Debt and preferred equity investments		1,076,542	1,580,306
Other assets		448,213	332,801
Total assets	[1]	11,707,567	12,766,320
Liabilities and equity
Mortgages and other loans payable, net		1,979,972	2,183,253
Lease liabilities		339,458	381,671
Other liabilities		302,798	177,080
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		4,935,795	5,517,198	5,947,855	$ 6,589,454
Total liabilities and equity/capital		11,707,567	12,766,320
Company's investments in unconsolidated joint ventures		3,823,322	2,912,842
Investments difference between carrying amount and underlying equity		170,600
Combined statements of income for the unconsolidated joint ventures
Total revenues		1,052,744	1,238,995	1,227,392
Real estate taxes		176,315	190,764	186,351
Interest expense before capitalized interest		185,934	246,848	236,719
Amortization of deferred financing costs		11,794	11,653	12,408
Transaction related costs		503	729	1,099
Depreciation and amortization		313,668	272,358	279,507
Total expenses		958,326	1,034,764	1,049,816
Net income		414,758	291,487	270,856
Company's equity in net (loss) income from unconsolidated joint ventures		(25,195)	(34,518)	7,311
Joint venture
Assets
Commercial real estate property, net		16,143,880	14,349,628
Cash and restricted cash		357,076	336,189
Tenant and other receivables, related party receivables, and deferred rents receivable		403,883	371,065
Other assets		2,001,612	2,039,429
Total assets		18,906,451	17,096,311
Liabilities and equity
Mortgages and other loans payable, net		9,749,204	8,951,869
Deferred revenue		1,341,571	1,501,616
Lease liabilities		1,002,563	897,380
Other liabilities		464,107	308,304
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		6,349,006	5,437,142
Total liabilities and equity/capital		18,906,451	17,096,311
Company's investments in unconsolidated joint ventures		3,823,322
Combined statements of income for the unconsolidated joint ventures
Total revenues		1,133,217	1,163,534	1,244,804
Operating expenses		180,201	202,881	219,440
Real estate taxes		220,633	212,355	226,961
Operating lease, rent		24,134	24,816	18,697
Interest expense before capitalized interest		325,500	372,408	363,055
Amortization of deferred financing costs		20,427	19,336	21,634
Transaction related costs		0	0	0
Depreciation and amortization		407,834	407,697	421,458
Total expenses		1,178,729	1,239,493	1,271,245
Loss on early extinguishment of debt		(194)	(1,031)	0
Net income		(45,706)	(76,990)	(26,441)
Company's equity in net (loss) income from unconsolidated joint ventures		(25,195)	(34,518)	7,311
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue		$ 15,800	$ 13,000	$ 14,200

[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $41.2 million and $205.2 million of land, $57.9 million and $481.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $37.8 million and $61.7 million of right of use assets, $10.3 million and $17.6 million of accumulated depreciation, $289.5 million and $169.5 million of other assets included in other line items, $94.0 million and $457.1 million of real estate debt, net, $0.7 million and $1.2 million of accrued interest payable, $29.9 million and $57.7 million of lease liabilities, and $56.6 million and $43.7 million of other liabilities included in other line items as of December 31, 2020 and December 31, 2019, respectively.