Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Assets
Commercial real estate property, net		$ 5,825,629		$ 5,399,002
Cash and restricted cash		304,999	$ 554,195	266,059
Tenant and other receivables, related party receivables, and deferred rents receivable		42,505		44,507
Other assets		445,635		448,213
Total assets	[1]	12,044,045		11,707,567
Liabilities and equity
Mortgages and other loans payable, net		1,848,701		1,979,972
Lease liabilities		455,385		339,458
Other liabilities		267,908		302,798
Equity		4,935,620	5,343,965	4,935,795	$ 5,517,198
Total liabilities and equity/capital		12,044,045		11,707,567
Company's investments in unconsolidated joint ventures		3,698,701		3,823,322
Investments difference between carrying amount and underlying equity		174,200
Combined statements of income for the unconsolidated joint ventures
Total revenues		226,102	314,303
Operating expenses		42,284	53,866
Real estate taxes		45,411	46,622
Interest expense before capitalized interest		39,868	56,813
Amortization of deferred financing costs		3,774	2,500
Depreciation and amortization		62,996	68,279
Total expenses		207,499	247,011
Net (loss) income		(3,855)	127,114
Company's equity in net (loss) income from unconsolidated joint ventures		(2,864)	(12,814)
Joint venture
Assets
Commercial real estate property, net		15,243,331		16,143,880
Cash and restricted cash		317,753		357,076
Tenant and other receivables, related party receivables, and deferred rents receivable		412,203		403,883
Other assets		1,950,444		2,001,612
Total assets		17,923,731		18,906,451
Liabilities and equity
Mortgages and other loans payable, net		9,414,923		9,749,204
Deferred revenue		1,311,191		1,341,571
Lease liabilities		985,622		1,002,563
Other liabilities		373,400		464,107
Equity		5,838,595		6,349,006
Total liabilities and equity/capital		17,923,731		$ 18,906,451
Company's investments in unconsolidated joint ventures		3,698,701
Combined statements of income for the unconsolidated joint ventures
Total revenues		301,541	282,520
Operating expenses		46,233	51,590
Real estate taxes		54,592	53,372
Operating lease, rent		5,644	6,361
Interest expense before capitalized interest		78,749	86,324
Amortization of deferred financing costs		6,384	4,814
Depreciation and amortization		114,879	98,584
Total expenses		306,481	301,045
Net (loss) income		(4,940)	(18,525)
Company's equity in net (loss) income from unconsolidated joint ventures		(2,864)	(12,814)
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue		$ 2,400	$ 2,200

[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: $179.6 million and $41.2 million of land, $282.3 million and $57.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $53.2 million and $37.8 million of right of use assets, $16.4 million and $10.3 million of accumulated depreciation, $297.1 million and $289.5 million of other assets included in other line items, $368.6 million and $94.0 million of real estate debt, net, $0.9 million and $0.7 million of accrued interest payable, $45.3 million and $29.9 million of lease liabilities, and $31.2 million and $56.6 million of other liabilities included in other line items as of March 31, 2021 and December 31, 2020, respectively.