Equipment Held for Operating Lease - Lease Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Lease rent revenue	$ 190,690	$ 175,609
Europe
Lessor, Lease, Description [Line Items]
Lease rent revenue	84,335	70,842
Asia
Lessor, Lease, Description [Line Items]
Lease rent revenue	42,127	40,717
United States
Lessor, Lease, Description [Line Items]
Lease rent revenue	39,178	40,100
South America
Lessor, Lease, Description [Line Items]
Lease rent revenue	10,030	11,338
Mexico
Lessor, Lease, Description [Line Items]
Lease rent revenue	5,284	4,721
Middle East
Lessor, Lease, Description [Line Items]
Lease rent revenue	4,117	3,286
Canada
Lessor, Lease, Description [Line Items]
Lease rent revenue	3,279	4,585
Africa
Lessor, Lease, Description [Line Items]
Lease rent revenue	$ 2,340	$ 20