Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Assets
Commercial real estate property, net	$ 6,931,798		$ 6,724,007
Cash and cash equivalents	554,195	$ 144,323	166,070
Tenant and other receivables, related party receivables, and deferred rents receivable	88,587		43,968
Other assets	353,644		332,801
Liabilities and equity
Mortgages and other loans payable, net	1,987,073		2,183,253
Deferred revenue	116,197		114,052
Lease liabilities	363,990		381,671
Other liabilities	214,968		177,080
Company's investments in unconsolidated joint ventures	2,848,363		2,912,842
Investments difference between carrying amount and underlying equity	122,600
Combined statements of income for the unconsolidated joint ventures
Operating expenses	53,866	57,698
Real estate taxes	46,622	46,688
Operating lease rent	7,367	8,298
Interest expense, net of interest income	37,494	50,525
Amortization of deferred financing costs	2,500	2,742
Depreciation and amortization	68,279	68,343
Total expenses	247,011	260,328
Company's equity in net (loss) income from unconsolidated joint ventures	(12,814)	(5,234)
Joint venture
Assets
Commercial real estate property, net	14,392,907		14,349,628
Cash and cash equivalents	329,205		336,189
Tenant and other receivables, related party receivables, and deferred rents receivable	346,837		371,065
Other assets	1,997,553		2,039,429
Total assets	17,066,502		17,096,311
Liabilities and equity
Mortgages and other loans payable, net	9,116,172		8,951,869
Deferred revenue	1,459,796		1,501,616
Lease liabilities	902,161		897,380
Other liabilities	284,364		308,304
Equity	5,304,009		5,437,142
Total liabilities and equity	17,066,502		17,096,311
Company's investments in unconsolidated joint ventures	2,848,363		$ 2,912,842
Combined statements of income for the unconsolidated joint ventures
Total revenues	282,520	307,519
Operating expenses	51,590	54,124
Real estate taxes	53,372	54,236
Operating lease rent	6,361	5,901
Interest expense, net of interest income	86,324	96,623
Amortization of deferred financing costs	4,814	5,216
Depreciation and amortization	98,584	104,331
Total expenses	301,045	320,431
Net loss before gain on sale	(18,525)	(12,912)
Company's equity in net (loss) income from unconsolidated joint ventures	(12,814)	(5,234)
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Escalation and reimbursement	$ 2,200	$ 2,500