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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Summary of net deferred tax position | The Company’s net deferred tax position as of December 31, 2016 and 2015, respectively, is as follows (in thousands).
|  | December 31,
|  | 2016 |  | 2015
Deferred tax assets |  |  |  |
Unrealized loss on derivatives |  | $ | 8,734 |  |  | $ | — |
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 |  | — |  |  | 32,831 |
Other |  | — |  |  | 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 |  | $ | — |  |  | $ | — |
Income tax expense reconciled to the tax computed at the statutory federal rate | The current income tax provision for the years ended December 31, 2016, 2015 and 2014, respectively, was comprised of the following (in thousands).
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Current income tax provision |  |  |  |  |  |
State income tax |  | $ | 108 |  |  | $ | 371 |  |  | $ | — |
Federal alternative minimum tax |  | (1,144 | ) |  | 2,588 |  |  | 133 |
Net current income tax (benefit) provision |  | $ | (1,036 | ) |  | $ | 2,959 |  |  | $ | 133 |
Reconciliations of the tax (benefit) expense computed at the statutory federal rate to the Company’s total income tax (benefit) provision for the years ended December 31, 2016, 2015 and 2014, respectively, is as follows (in thousands).
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Federal tax (benefit) expense at statutory rate (1) |  | $ | (34,333 | ) |  | $ | (289,412 | ) |  | $ | 61,301 |
State income tax |  | 539 |  |  | (13,215 | ) |  | 2,707 |
Permanent differences (2) |  | (499 | ) |  | 698 |  |  | 397 |
Federal alternative minimum tax |  | 1,144 |  |  | (2,588 | ) |  | (133 | )
Change in federal valuation allowance |  | 33,688 |  |  | 145,777 |  |  | — |
Change in state valuation allowance |  | (539 | ) |  | 8,413 |  |  | (30 | )
Net deferred income tax (benefit) provision |  | — |  |  | (150,327 | ) |  | 64,242 |
Net current income tax (benefit) provision |  | (1,036 | ) |  | 2,959 |  |  | 133 |
Total income tax (benefit) provision |  | $ | (1,036 | ) |  | $ | (147,368 | ) |  | $ | 64,375 |
__________________
(1) | The statutory federal tax rate was 35% for the years ended December 31, 2016, 2015 and 2014.
(2) | Amount is primarily attributable to stock-based compensation.

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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