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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Current State and Local Tax Expense (Benefit) | $ 108 | $ 371 | $ 0
Deferred tax assets |  |  |
Unrealized loss on derivatives | 8,734 | 0 |
Net operating loss carryforwards | 137,757 | 79,208 |
Alternative minimum tax carryforward | 8,633 | 9,785 |
Percentage depletion carryover | 2,595 | 2,442 |
Property and equipment | 44,391 | 42,757 |
Deferred gain on sale leaseback transaction | 0 | 32,831 |
Other | 0 | 7,396 |
Total deferred tax assets | 202,110 | 174,419 |
Valuation allowance on deferred tax assets | (190,255) | (154,320) |
Total deferred tax assets, net of valuation allowance | 11,855 | 20,099 |
Deferred tax liabilities |  |  |
Unrealized gain on derivatives | 3,800 | 5,699 |
Other | (8,055) | (14,400) |
Total deferred tax liabilities | (11,855) | (20,099) |
Net deferred tax liabilities | 0 | 0 |
Current Federal Tax Expense (Benefit) | (1,144) | 2,588 | 133
Net current income tax (benefit) provision | $ (1,036) | $ 2,959 | $ 133

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