Summary of Significant Accounting Policies - Schedule of Fixed and Variable Lease Payments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Fixed payments	$ 105,592	$ 108,071	$ 315,971	$ 329,281
Variable payments	21,835	20,209	64,335	62,400
Total Rental and Tenant Reimbursement Revenue	$ 127,427	$ 128,280	$ 380,306	$ 391,681