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Operations and Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Accrued payroll and related items | $ 29,364 | $ 18,545
Insurance and claims accruals | 21,172 | 17,994
Payables to leased capacity providers | 11,085 | 14,725
Accrued expenses | $ 61,621 | $ 51,264

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