Non-binding letter of intent to purchase number of aircraft.

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Investment in Other Companies (Details) $ in Thousands	3 Months Ended	12 Months Ended
Investment in Other Companies (Details) $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2022 aircraft	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Long-term debt	$ 3,201,398			$ 3,109,218
Eve UAM, LLC ("Eve") \| Strategic partnership \| Electric vertical takeoff and landing ("eVTOL") aircraft \| Forecast
Non-binding letter of intent to purchase number of aircraft \| aircraft		100
Aero Engines, LLC.
Payments to acquire interest in joint venture			$ 22,300
Investment ownership (as a percent)	75.00%		75.00%
Additional interest in Joint venture	$ 3,300		$ 1,000
Long-term debt	0
Investment balance in Aero Engines	23,900
Aero Engines, LLC. \| Other Nonoperating Income.
Company's portion of loss generated by Aero Engines	$ 400