Summary of Significant Accounting Policies - Lease Income for Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Fixed lease income	$ 165,044	$ 171,054	$ 329,012	$ 349,081
Variable lease income	11,177	10,280	21,636	20,834
Straight-line rent write-off	0	0	0	(2,850)
Total lease income	$ 176,221	$ 181,334	$ 350,648	$ 367,065