Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Liabilities    
Salaries, wages, and commissions $ 34,723 $ 25,470
Insurance liabilities 25,295 19,770
Other 48,933 29,847
Total Accrued Liabilities $ 108,951 $ 75,087