Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Fixed-lease income	$ 929,335	$ 1,067,381	$ 2,939,257	$ 3,196,202
Variable lease income	64,496	241,527	330,315	691,330
Total lease income	993,831	$ 1,308,908	3,269,572	$ 3,887,532
Tenant receivables and accrued revenue
Lessor, Lease, Description [Line Items]
Straight-line receivables	$ 611,600		$ 611,600		$ 618,400