Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Assets
Commercial real estate property, net	$ 6,761,243		$ 6,761,243		$ 6,724,007
Cash and cash equivalents	221,404	$ 121,751	221,404	$ 121,751	166,070
Tenant and other receivables, related party receivables, and deferred rents receivable	72,806		72,806		43,968
Other assets	514,873		514,873		332,801
Liabilities and equity
Mortgages and other loans payable, net	2,391,744		2,391,744		2,183,253
Deferred revenue	117,615		117,615		114,052
Lease liabilities	358,419		358,419		381,671
Other liabilities	306,077		306,077		177,080
Company's investments in unconsolidated joint ventures	2,946,673		2,946,673		2,912,842
Investments difference between carrying amount and underlying equity	166,800		166,800
Combined statements of income for the unconsolidated joint ventures
Operating expenses	45,910	59,847	140,673	175,862
Real estate taxes	43,522	49,626	131,805	143,008
Operating lease rent	6,973	8,295	22,171	24,891
Interest expense, net of interest income	23,536	48,112	91,100	145,797
Amortization of deferred financing costs	3,151	3,112	8,312	8,566
Depreciation and amortization	92,516	70,464	256,736	208,268
Total expenses	248,212	263,341	744,980	782,052
Company's equity in net (loss) income from unconsolidated joint ventures	(432)	(9,864)	(15,445)	(22,644)
Joint venture
Assets
Commercial real estate property, net	15,045,603		15,045,603		14,349,628
Cash and cash equivalents	326,488		326,488		336,189
Tenant and other receivables, related party receivables, and deferred rents receivable	404,138		404,138		371,065
Other assets	1,940,540		1,940,540		2,039,429
Total assets	17,716,769		17,716,769		17,096,311
Liabilities and equity
Mortgages and other loans payable, net	9,652,507		9,652,507		8,951,869
Deferred revenue	1,400,458		1,400,458		1,501,616
Lease liabilities	1,015,477		1,015,477		897,380
Other liabilities	294,972		294,972		308,304
Equity	5,353,355		5,353,355		5,437,142
Total liabilities and equity	17,716,769		17,716,769		17,096,311
Company's investments in unconsolidated joint ventures	2,946,673		2,946,673		$ 2,912,842
Combined statements of income for the unconsolidated joint ventures
Total revenues	292,929	286,010	846,967	883,977
Operating expenses	44,650	50,759	131,578	153,397
Real estate taxes	56,459	53,321	161,566	159,544
Operating lease rent	6,385	6,713	18,947	18,848
Interest expense, net of interest income	79,723	92,601	245,685	282,917
Amortization of deferred financing costs	5,575	4,436	15,197	14,434
Depreciation and amortization	103,262	100,736	300,700	308,748
Total expenses	296,054	308,566	873,673	937,888
Loss on early extinguishment of debt	0	(1,031)	0	(1,031)
Net loss before gain on sale	(3,125)	(23,587)	(26,706)	(54,942)
Company's equity in net (loss) income from unconsolidated joint ventures	(432)	(9,864)	(15,445)	(22,644)
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Escalation and reimbursement	$ 2,200	$ 2,400	$ 6,100	$ 8,800