Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities    
Salaries, wages, and commissions $ 29,970 $ 34,085
Insurance liabilities 25,045 25,212
Deferred revenue 17,261 19,963
Interest payable on long-term debt 3,957 3,951
Other 24,049 21,025
Total accrued liabilities $ 100,282 $ 104,236