Basis of Presentation and Summary of Significant Accounting Policies - Lease Income for Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Fixed lease income	$ 205,736			$ 209,890	$ 419,152		$ 425,471
Variable lease income	12,649			13,608	26,264		27,752
Straight-line rent write-off	(19)	[1]	$ (2,900)		(2,927)	[1]
Total lease income	$ 218,366			$ 223,498	$ 442,489		$ 453,223

[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 three months ended March 31, 2020. Additionally, we wrote-off the related deferred leasing costs of $2.2 million during the three months ended March 31, 2020. The write-offs of deferred leasing costs are recorded in depreciation and amortization in our condensed consolidated statements of operations.