Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accrued Liabilities    
Salaries, wages, and commissions $ 25,773 $ 20,684
Insurance liabilities 21,777 20,410
Other 33,649 23,305
Total Accrued Liabilities $ 81,199 $ 64,399