Lease Income - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Fixed lease payments	$ 142,979	$ 171,866	$ 473,466	$ 538,601
Variable lease payments	12,660	21,979	58,634	70,892
Total lease payments	155,639	193,845	532,100	609,493
Amortization of acquired above and below-market leases	(276)	1,670	(4,037)	4,539
Total rental revenue	155,363	195,515	528,063	614,032
Sublease Income	52,000	59,800	175,500	180,200
Loss recognized at commencement, net	0	(5,973)	0	(5,973)
Interest income	1,108	484	3,313	484
Total gain (loss) recognized on sales-type leases	$ 1,108	$ (5,489)	$ 3,313	$ (5,489)