Lease Income - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Fixed lease payments	$ 165,808	$ 172,511	$ 330,487	$ 366,735
Variable lease payments	20,695	21,745	45,974	48,913
Total lease payments	186,503	194,256	376,461	415,648
Amortization of acquired above and below-market leases	(1,892)	1,630	(3,761)	2,869
Total rental revenue	184,611	195,886	372,700	418,517
Sublease Income	66,700	60,800	132,500	127,100
Interest income	$ 1,105	$ 0	$ 2,205	$ 0