Basis of Presentation and Summary of Significant Accounting Policies - Lease Income for Operating Leases (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Fixed lease income		$ 200,295	$ 213,945	$ 619,447	$ 639,359
Variable lease income		14,578	15,005	40,842	42,814
Straight-line rent write-off	[1]			(2,927)
Total lease income		$ 214,873	$ 228,950	$ 657,362	$ 682,173

[1] We monitor the collectability of all unpaid rent amounts. The onset of COVID-19 and the anticipated economic slowdown resulted in a $2.9 million write-off of accrued straight-line rent during the nine months ended September 30, 2020. Additionally, we wrote-off the related deferred leasing costs of $2.4 million during the nine months ended September 30, 2020. The write-offs of deferred leasing costs are recorded in depreciation and amortization in our condensed consolidated statements of operations.