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Operations and Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Accounting Policies [Abstract] |  |
Accrued payroll and related items | $ 23,804 | $ 29,364
Insurance and claims accruals | 19,961 | 21,172
Payables to Leased Capacity Providers | 10,526 | 11,085
Accrued expenses | $ 54,291 | $ 61,621

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