Loss on Disposal of Assets (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) aircraft_engine	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets	$ 13,410	$ 1,069		$ 16,873	$ 6,561
Disposal of excess and obselete inventory			$ 2,200	11,600
Write-down of certain held-for-sale assets to fair value less cost to sell				3,100
Write-down of unrecoverable costs previously capitalized for enterprise accounting software project				2,300
Gain on sale-leaseback transaction				$ 100
Number of aircraft engines sold | aircraft_engine			5
V2500 SelectOne Engine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of other property, plant, and equipment			$ 9,500
Loss on disposition of assets			$ 4,400