Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities    
Salaries, wages, and commissions $ 26,998 $ 34,085
Insurance liabilities 25,969 25,212
Deferred revenue 17,081 19,963
Interest payable on long-term debt 9,575 3,951
Other 23,789 21,025
Total accrued liabilities $ 103,412 $ 104,236