Annual report pursuant to Section 13 and 15(d)

Income Taxes (Income Tax Reconciliation) (Details)

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Income Taxes (Income Tax Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of income tax rate reconciliation      
Income tax expense computed at the statutory federal income tax rate 35.00% 35.00% 35.00%
Percentage depletion carryforward     (8.00%)
State taxes net of federal benefit 1.00% 1.00% 4.00%
Restricted stock and stock options     5.00%
Section 162(m) (1.00%) 2.00% 6.00%
Valuation allowance (54.00%)    
Effective income tax rate (19.00%) 38.00% 42.00%
Components of income tax expense      
Current state income tax expense     $ 326
Deferred federal income tax (benefit) expense $ (69,087) $ 22,373 2,652
Deferred state income tax (benefit) expense (1,282) 761 126
Valuation allowance 108,843    
Total income tax expense $ 38,474 $ 23,134 $ 3,104