Equipment Held for Operating Lease - Lease Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Lease rent revenue	$ 142,895	$ 190,690
Europe
Lessor, Lease, Description [Line Items]
Lease rent revenue	57,972	84,335
United States
Lessor, Lease, Description [Line Items]
Lease rent revenue	33,291	39,178
Asia
Lessor, Lease, Description [Line Items]
Lease rent revenue	32,198	42,127
South America
Lessor, Lease, Description [Line Items]
Lease rent revenue	11,686	10,030
Mexico
Lessor, Lease, Description [Line Items]
Lease rent revenue	3,670	5,284
Middle East
Lessor, Lease, Description [Line Items]
Lease rent revenue	2,067	4,117
Canada
Lessor, Lease, Description [Line Items]
Lease rent revenue	2,011	3,279
Africa
Lessor, Lease, Description [Line Items]
Lease rent revenue	$ 0	$ 2,340