Leases - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest and Other Income [Abstract]
Fixed income from operating leases	$ 268,290	$ 231,569	$ 531,246	$ 457,795
Variable income from operating leases	72,352	56,684	137,368	112,775
Interest income from direct financing leases	$ 2,180	$ 2,150	$ 4,343	$ 5,419