Income Taxes (Details 2)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of effective tax rate of the Company with U.S. federal statutory income tax rate
United States federal statutory income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit (as a percent)	1.30%	1.30%	(2.40%)
Percentage depletion deduction (as a percent)	5.70%	(0.70%)	(7.30%)
Section 199 domestic manufacturing deduction (as a percent)	0.00%	(0.50%)	0.00%
Change in valuation allowance (as a percent)	(86.90%)	(4.90%)	(7.10%)
Non-deductible expenses	(2.00%)	0.00%	0.00%
Non-deductible goodwill impairment	(9.10%)	0.00%	0.00%
Deferred tax adjustments	(4.70%)	0.00%	0.00%
Other (as a percent)	0.60%	0.60%	0.20%
Effective tax rate (as a percent)	(60.10%)	30.80%	18.40%