Leases (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating Leased Assets [Line Items]
Fixed and in-substance fixed lease income		$ 197,234	$ 202,467	$ 393,288	$ 407,409
Variable lease income		68,661	61,748	132,728	126,417
Uncollectible straight-line rent		(1,792)	(16,287)	(3,827)	(20,189)
Uncollectible amounts billable in lease income		6,620	(35,792)	8,895	(39,844)
Total lease income		276,730	222,552	543,087	497,089
Accounts and Notes Receivable, Net		131,510		131,510		$ 143,633
Straight-line rent receivables				88,298		86,615
Tenant Receivables [Member]
Operating Leased Assets [Line Items]
Accounts and Notes Receivable, Net		23,984		23,984		39,658
Other Receivable [Member]
Operating Leased Assets [Line Items]
Accounts and Notes Receivable, Net	[1]	19,228		19,228		$ 17,360
Lessor [Member]
Operating Leased Assets [Line Items]
Above/below market rent and tenant rent inducement amortization, net		$ 6,007	$ 10,416	$ 12,003	$ 23,296

[1]   ⁽¹⁾ Other receivables include construction receivables, insurance receivables, and amounts due from real estate partnerships for Management, transaction and other fee income.