Loss on Disposal of Assets - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) aircraft_engine	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets	$ 17,350	$ 9,580	$ 4,168
Inventory write-down	13,400	$ 4,400
Write down of assets held-for-sale	3,100
Capitalized costs for enterprise accounting software write-off	2,400
Gain on sale-leaseback transaction	$ 1,500
Number of engines sold | aircraft_engine		6
V2500 SelectOne Engine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from the sale of used engines		$ 11,400
Loss on sale of used engines		$ (5,200)