Variable Interest Entities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Aircraft Term_Loan Entity	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Borrowings from secured financings, net of debt issuance costs	$ 1,129,345	$ 798,457
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of VIE's consolidated | Entity	4
Number of Aircraft Sold | Aircraft	6
Air Knight VIEs | Variable Interest Entity, Primary Beneficiary | ECA Term Financings
Variable Interest Entity [Line Items]
Number of outstanding term loan | Term_Loan	6
Debt Instrument, Term	12 years
Net book value of flight equipment held for lease	$ 376,630
Consolidated debt outstanding	$ 145,443