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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]    
Accrued salaries, wages and benefits $ 11,434 $ 15,071
Accrual for insurance claims liabilities 59,208 60,365
Sales taxes 4,318 5,909
Property taxes 482 908
Sale-leaseback arrangement 821 676
Accounting and audit fees 258 344
Interest 22 22
Equipment purchase 115 461
Other accrued expenses 1,043 881
Total accrued liabilities $ 77,701 $ 84,637