Summary of Significant Accounting Policies - Marketable Securities and Long-Term Restricted Investments and Due from Broker (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Summary of Significant Accounting Policies [Line Items] | ||
| Due from broker | $ 49,921 | $ 0 |
| Air Wisconsin | ||
| Summary of Significant Accounting Policies [Line Items] | ||
| Equity securities, current and restricted investments | $ 38,168 | $ 100,815 |