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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 |  |

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