Income Taxes (Details 2) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Amount computed using the statutory rate	$ 9,887	$ 5,041	$ (45,655)
State & local taxes	904	317	(2,870)
Percentage depletion carryforward	(1,564)	(1,323)	(1,309)
Non-deductible stock option expense	213	115	292
Share-based compensation	90	780	9
Other	(643)	1,132	303
Change in valuation allowance	(11,828)	(5,742)	50,866
Income tax expense (benefit)	$ (2,941)us-gaap_IncomeTaxExpenseBenefit	$ 320us-gaap_IncomeTaxExpenseBenefit	$ 1,636us-gaap_IncomeTaxExpenseBenefit

Effective Income Tax Rate Reconciliation, Deduction, Statutory Depletion

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Effective Income Tax Reconciliation, Write-off of Deferred Tax Assets

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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