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Details of Selected Balance Sheet Accounts - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Details of Selected Balance Sheet Accounts [Abstract]    
Accrued compensation $ 16,840 $ 18,463
Accrued taxes, other than income taxes 11,029 7,307
Insurance liabilities 6,677 7,694
Accrued interest 3,605 2,202
Accrued commissions 1,263 1,416
Other 5,974 7,422
Accrued liabilities $ 45,388 $ 44,504