Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 27, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenues		$ 278,997	$ 312,188	$ 578,179	$ 629,068
Rental Revenue [Member]
Segment Reporting Information [Line Items]
Reduction of revenue		13,200		18,500
General reserve increase		2,100		1,500
Not probable for collection		7,400		9,400
Straight line rent receivable, increase in reserve		3,700		7,600
COVID-19 effect		8,400
COVID-19 effect, general reserve increase		900
COVID-19 effect, amount not probable For collection		3,800
COVID-19 effect, straight line rent receivable, increase in reserve		3,700
Deferral agreements		3,600
Deferral agreements, abated		11,200
Total revenues		278,576	312,043	577,162	628,886
Fees From Managed Partnership [Member]
Segment Reporting Information [Line Items]
Total revenues		$ 421	$ 145	$ 1,017	$ 182
Subsequent Event [Member] | Rental Revenue [Member]
Segment Reporting Information [Line Items]
Deferral agreements	$ 5,300