Leases (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Rent_Agreement	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Operating Leased Assets [Line Items]
Fixed and in-substance fixed lease income		$ 202,467	$ 200,909	$ 407,409		$ 403,072
Variable lease income		61,748	62,610	126,417		125,445
Uncollectible straight-line rent		(16,287)	(3,496)	(20,189)		(3,781)
Uncollectible amounts in lease income		(35,792)	(580)	(39,844)		(1,444)
Total lease income		222,552	266,236	$ 497,089		543,539
Weighted Average Deferral Period				3 months
Weighted Average Repayment Periods				10 months
Accounts and Notes Receivable, Net		186,232		$ 186,232	$ 169,337
Straight-line rent receivables				94,512	107,087
Tenant Receivables [Member]
Operating Leased Assets [Line Items]
Accounts and Notes Receivable, Net	[1]	62,228		62,228	35,526
Payments Due Under Rent Deferral Agreements				6,500
Other Receivable [Member]
Operating Leased Assets [Line Items]
Accounts and Notes Receivable, Net	[2]	29,492		$ 29,492	$ 26,724
COVID-19 [Member]
Operating Leased Assets [Line Items]
Number of mutually accepted agreements | Rent_Agreement				600
Pro-rata base rent				$ 16,400
Percentage of annual base rent				1.80%
Lessor [Member]
Operating Leased Assets [Line Items]
Above/below market rent and tenant rent inducement amortization, net		$ 10,416	$ 6,793	$ 23,296		$ 20,247

[1] Tenant receivables include $6.5 million of lease payments due under rent deferral agreements executed as of June 30, 2020.

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