Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities    
Salaries, wages, and commissions $ 25,470 $ 20,684
Insurance liabilities 19,770 20,410
Other 29,847 23,305
Total Accrued Liabilities $ 75,087 $ 64,399