Leases - Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest and Other Income [Abstract]
Fixed income from operating leases	$ 262,937	$ 226,226
Variable income from operating leases	65,035	56,091
Interest income from direct financing leases	$ 2,163	$ 3,269