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Income Taxes (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current income tax provision |  |  |
State income tax | $ 108 | $ 371 | $ 0
Federal alternative minimum tax | (1,144) | 2,588 | 133
Net current income tax (benefit) provision | (1,036) | 2,959 | 133
Deferred income tax provision (benefit) |  |  |
Federal tax (benefit) expense at statutory rate | (34,333) | (289,412) | 61,301
State income tax | 539 | (13,215) | 2,707
Permanent differences | (499) | 698 | 397
Federal alternative minimum tax | 1,144 | (2,588) | (133)
Change in federal valuation allowance | 33,688 | 145,777 | 0
Change in state valuation allowance | (539) | 8,413 | (30)
Net deferred income tax (benefit) provision | 0 | (150,327) | 64,242
Total income tax (benefit) provision | $ (1,036) | $ (147,368) | $ 64,375
Federal statutory rate | 35.00% | 35.00% | 35.00%

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