Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Compensation related	$ 20,479	$ 18,744
Workers' compensation self-insured risk reserve	6,528	6,956
Health self-insured risk reserve	3,976	3,753
Accrual for receipts	2,391	4,178
Ad valorem taxes	2,081	2,626
Sales tax	1,873	1,652
Insurance obligations	5,695	9,576
Professional fee accrual	1,581	946
Fuel accrual	989	958
Accrued interest	6,380	1,940
Accrued expenses	$ 51,973	$ 51,329