Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Summary of accrued liabilities
Accrued payroll and other employee related expenses	$ 120,138	$ 18,974
Accrued business taxes	29,054	9,168
Self-insurance reserves	35,240	10,386
Accrued interest	33,712	2,329
Facility closure reserves	5,228	1,646
Casualty claims in excess of retained loss limit	8,845	11,335
Customer obligations	38,173	6,105
Other	23,515	7,723
Total accrued liabilities	$ 293,905	$ 67,666