Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Accrued salaries, wages and benefits	$ 10,544	$ 10,818
Accrual for insurance liabilities	4,826	5,223
Property taxes	1,354	1,615
Sales taxes	1,561	1,722
Interest	10	19
Other accrued expenses	112	549
Total accrued liabilities	$ 18,407	$ 19,946