Annual report pursuant to Section 13 and 15(d)

Operations and Summary of Significant Accounting Policies - Accrued Expenses (Details)

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Operations and Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
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