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Details of Selected Balance Sheet Accounts - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Details of Selected Balance Sheet Accounts [Abstract]    
Accrued compensation $ 22,072 $ 18,463
Accrued taxes, other than income taxes 12,558 7,307
Insurance liabilities 6,684 7,694
Accrued interest 5,185 2,202
Accrued commissions 1,664 1,416
Other 5,268 7,422
Accrued liabilities $ 53,431 $ 44,504