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Equipment Held for Operating Lease and Notes Receivable - Schedule of Carrying Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Engines and related equipment
Lessor, Lease, Description [Line Items]
Gross Value	$ 2,381,719	$ 2,238,160
Accumulated Depreciation	(497,146)	(445,780)
Net Book Value	1,884,573	1,792,380
Aircraft and airframes
Lessor, Lease, Description [Line Items]
Gross Value	82,128	89,613
Accumulated Depreciation	(6,903)	(7,312)
Net Book Value	75,225	82,301
Marine vessel
Lessor, Lease, Description [Line Items]
Gross Value	13,010	12,963
Accumulated Depreciation	(1,556)	(1,031)
Net Book Value	11,454	11,932
Equipment Held For Operating Lease
Lessor, Lease, Description [Line Items]
Gross Value	2,476,857	2,340,736
Accumulated Depreciation	(505,605)	(454,123)
Net Book Value	$ 1,971,252	$ 1,886,613

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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