Leases - Leases as Lessor (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease revenue:
Minimum lease revenue	$ 132,574	$ 113,147	$ 260,280	$ 220,632
Variable lease revenue (primarily recoveries from customers)	18,233	12,849	34,835	25,445
Total lease revenue	$ 150,807	$ 125,996	$ 295,115	$ 246,077