Leases (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Rent_Agreement	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Operating Leased Assets [Line Items]
Fixed and in-substance fixed lease income		$ 200,020	$ 204,686	$ 607,429		$ 607,758
Variable lease income		60,535	59,872	186,952		185,317
Uncollectible straight line rent		(7,678)	(1,279)	(27,867)		(5,060)
Uncollectible amounts billable in lease income		(26,147)	(2,222)	(65,991)		(3,667)
Total lease income		234,541	272,143	$ 731,630		815,682
Weighted Average Deferral Period				3 months
Weighted Average Repayment Periods				9 months 6 days
Accounts and Notes Receivable, Net		159,137		$ 159,137	$ 169,337
Straight-line rent receivables				91,019	107,087
Tenant Receivables [Member]
Operating Leased Assets [Line Items]
Accounts and Notes Receivable, Net	[1]	50,290		50,290	35,526
Payments Due Under Rent Deferral Agreements				15,500
Other Receivable [Member]
Operating Leased Assets [Line Items]
Accounts and Notes Receivable, Net	[2]	17,828		$ 17,828	$ 26,724
COVID-19 [Member]
Operating Leased Assets [Line Items]
Number of mutually accepted agreements | Rent_Agreement				1,300
Pro-rata base rent				$ 30,600
Percentage of annual base rent				3.50%
Lessor [Member]
Operating Leased Assets [Line Items]
Above/below market rent and tenant rent inducement amortization, net		$ 7,811	$ 11,086	$ 31,107		$ 31,334

[1] Tenant receivables include $15.5 million of lease payments due under rent deferral agreements executed as of September 30, 2020.

[2] Other receivables include construction receivables, insurance receivables, and amounts due from real estate partnerships for Management, transaction and other fee income.