Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Accrued Expenses [Abstract]
Compensation related	$ 14,048	$ 41,620
Workers' compensation self-insured risk reserve	7,481	9,115
Health self-insured risk reserve	3,935	4,756
Accrual for receipts	5,320	416
Ad valorem taxes	2,078	7,160
Sales tax	1,634	3,123
Insurance obligations	3,769	2,898
Professional fee accrual	729	1,221
Fuel accrual	693	1,371
Accrued interest	19,693	19,130
Accrued Expenses	$ 59,380	$ 90,810