Equipment Held for Operating Lease and Notes Receivable - Schedule of Carrying Values (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessor, Lease, Description [Line Items]
Accumulated depreciation	$ (11,629)	$ (11,356)
Net Book Value	31,169	31,753
Engines and related equipment
Lessor, Lease, Description [Line Items]
Gross Value	2,264,712	2,238,160
Accumulated depreciation	(468,290)	(445,780)
Net Book Value	1,796,422	1,792,380
Aircraft and airframes
Lessor, Lease, Description [Line Items]
Gross Value	87,746	89,613
Accumulated depreciation	(8,088)	(7,312)
Net Book Value	79,658	82,301
Marine vessel
Lessor, Lease, Description [Line Items]
Gross Value	13,010	12,963
Accumulated depreciation	(1,206)	(1,031)
Net Book Value	11,804	11,932
Assets Leased to Others
Lessor, Lease, Description [Line Items]
Gross Value	2,365,468	2,340,736
Accumulated depreciation	(477,584)	(454,123)
Net Book Value	$ 1,887,884	$ 1,886,613