Investments in Other Companies (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 aircraft	Jan. 01, 2024 USD ($)
Eve UAM, LLC | Strategic partnership | Electric vertical takeoff and landing ("eVTOL") aircraft
Non-binding letter of intent to purchase number of aircraft | aircraft				100
Aero Engines, LLC. ("Aero Engines")
Payments to acquire interest in joint venture		$ 26,600
Investment ownership (as a percent)	75.00%	75.00%
Long-term debt	$ 0	$ 0
Investment balance in other companies	$ 25,100	25,100
Aero Engines, LLC. ("Aero Engines") | Other income (loss), net
Company's portion of income (loss) generated by other companies		$ 200
Contour Airlines
Investment ownership (as a percent)	9.90%	9.90%
Number of Board of Directors Seat Held | item	1
Total Number of Board of Directors Seat | item	5
Percentage of Board of Directors Seat Held	20.00%	20.00%
Payments to acquire equity method investment	$ 9,900
Contour Airlines | Subsequent event
Investment ownership (as a percent)					25.00%
Equity Method Investments, Anticipated Amount					$ 25,000
Contour Airlines | Other Assets
Investment balance in other companies	9,900	$ 9,900
Eve Holdings, Inc. ("Eve")
Warrants to purchase shares | shares			1,500,000
Warrants exercise price (in dollars per share) | $ / shares			$ 0.01
Initial investment			$ 10,000
Eve Holdings, Inc. ("Eve") | Level 3
Beginning balance		14,180
Purchases			6,551
Realized loss on forfeiture of put options		$ (827)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)
Unrealized loss		$ (876)	7,629
Ending balance	12,477	$ 12,477	$ 14,180
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other Nonoperating Income (Expense)
Eve Holdings, Inc. ("Eve") | Level 3 | Black Scholes Option Pricing Model | Volatility
Measurement input			0.52
Eve Holdings, Inc. ("Eve") | Put option
Shares obtained | shares			1,000,000
Shares sold | shares		600,411
Shares reduced | shares		600,411
Eve Holdings, Inc. ("Eve") | Other Assets
Investment balance in other companies	$ 15,400	$ 15,400
Eve Holdings, Inc. ("Eve") | Other income (loss), net
Net realized gain from sale of shares		2,100
Company's portion of income (loss) generated by other companies		$ (3,100)
Eve Holdings, Inc. ("Eve") | Class A common stock
Number of shares acquired | shares			1,000,000