Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities    
Salaries, wages, and commissions $ 34,085 $ 25,470
Insurance liabilities 25,212 19,770
Deferred revenue 19,963 9,275
Interest payable on long-term debt 3,951  
Other 21,025 20,572
Total accrued liabilities $ 104,236 $ 75,087