Equipment Held for Operating Lease - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 engine region	Dec. 31, 2019 airframe_part_package	Dec. 31, 2019 aircraft.	Dec. 31, 2019 USD ($)	Dec. 31, 2019 vessel	Dec. 31, 2018 engine	Dec. 31, 2018 airframe_part_package	Dec. 31, 2018 aircraft.	Dec. 31, 2018 USD ($)
Leases [Abstract]
Number of equipment pieces held for lease	263	10	12		1	244	10	17
Net book value of equipment held for operating lease | $				$ 1,650,918					$ 1,673,135
Number of geographic regions in which aircraft lessees are domiciled in | region	8