Revenue Recognition - Components of Lease Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Fixed lease revenues	$ 312,285	$ 377,524	$ 649,331	$ 807,611
Variable lease revenues	(3,969)	31,708	50,203	88,927
Total lease revenues	$ 308,316	$ 409,232	$ 699,534	$ 896,538