Leases - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest and Other Income [Abstract]
Fixed income from operating leases	$ 276,430	$ 239,715	$ 807,677	$ 697,510
Variable income from operating leases	77,086	62,226	214,453	175,001
Interest income from direct financing leases	$ 2,179	$ 2,150	$ 6,522	$ 7,569