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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Tax Disclosure [Abstract] |
Schedule of componenets of provision for income taxes | The provision for income taxes consists of the following:
|  | For the Years Ended December 31,
|  | 2013 |  | 2012 |  | 2011
|  | (in thousands)
Current portion of income tax expense (benefit) |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |  |  | $ | (1,757 | )
State |  | 2,121 |  |  | 370 |  |  | 1,553 |
Deferred portion of income tax expense (benefit) |  | 105,555 |  |  | (29,638 | ) |  | 123,789 |
Total income tax expense (benefit) |  | $ | 107,676 |  |  | $ | (29,268 | ) |  | $ | 123,585 |
Effective tax rate |  | 38.6 | % |  | 35.0 | % |  | 36.5 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The components of the net deferred income tax liabilities are as follows:
|  | As of December 31,
|  | 2013 |  | 2012
|  | (in thousands)
Deferred tax liabilities: |  |  |  |
Oil and gas properties |  | $ | 768,463 |  |  | $ | 678,624 |
Derivative asset |  | 9,529 |  |  | 15,942 |
Other |  | 1,245 |  |  | 6,443 |
Total deferred tax liabilities |  | 779,237 |  |  | 701,009 |
Deferred tax assets: |  |  |  |  |  |
Federal and state tax net operating loss carryovers |  | 91,788 |  |  | 113,522 |
Net Profits Plan liability |  | 20,913 |  |  | 29,233 |
Stock compensation |  | 18,820 |  |  | 18,026 |
Other long-term liabilities |  | 13,341 |  |  | 16,739 |
Total deferred tax assets |  | 144,862 |  |  | 177,520 |
Valuation allowance |  | (5,001 | ) |  | (5,315 | )
Net deferred tax assets |  | 139,861 |  |  | 172,205 |
Total net deferred tax liabilities |  | 639,376 |  |  | 528,804 |
Less: current deferred income tax liabilities |  | (172 | ) |  | (5,442 | )
Add: current deferred income tax assets |  | 10,921 |  |  | 14,021 |
Non-current net deferred tax liabilities |  | $ | 650,125 |  |  | $ | 537,383 |
Current federal income tax refundable |  | $ | 4,630 |  |  | $ | 2,511 |
Current state income tax refundable |  | $ | — |  |  | $ | 853 |
Current state income tax payable |  | $ | 1,460 |  |  | $ | — |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
| For the Years Ended December 31,
| 2013 |  | 2012 |  | 2011
| (in thousands)
Federal statutory tax expense (benefit) | $ | 97,514 |  |  | $ | (29,231 | ) |  | $ | 118,652 |
Increase (decrease) in tax resulting from: |  |  |  |  |
State tax expense (benefit) (net of federal benefit) | 9,400 |  |  | (992 | ) |  | 6,458 |
Research and development credit | — |  |  | (970 | ) |  | (4,516 | )
Change in valuation allowance | (314 | ) |  | 1,524 |  |  | 1,627 |
Statutory depletion | (154 | ) |  | (210 | ) |  | (341 | )
Other | 1,230 |  |  | 611 |  |  | 1,705 |
Income tax expense (benefit) | $ | 107,676 |  |  | $ | (29,268 | ) |  | $ | 123,585 |
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | The total amount recorded for unrecognized tax benefits is presented below:
| For the Years Ended December 31,
| 2013 |  | 2012 |  | 2011
| (in thousands)
Beginning balance | $ | 2,278 |  |  | $ | 1,961 |  |  | $ | 807 |
Additions based on tax positions related to current year | — |  |  | — |  |  | 1,172 |
Additions for tax positions of prior years | 80 |  |  | 317 |  |  | 183 |
Reductions for lapse of statute of limitations | — |  |  | — |  |  | (201 | )
Ending balance | $ | 2,358 |  |  | $ | 2,278 |  |  | $ | 1,961 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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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=6907707&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=6907707&loc=d3e32687-109319 + Details
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