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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
IRS Proposed R&D Tax Adjustment | $ 4,600,000 |  |
Excess tax benefit | 0 | 0 | 0
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 4,000,000 |  |
Current portion of income tax expense (benefit): |  |  |
Federal | 0 | 0 | (1,757,000)
State | 2,121,000 | 370,000 | 1,553,000
Deferred portion of income tax expense (benefit) | (105,555,000) | 29,638,000 | (123,789,000)
Income tax (expense) benefit | 107,676,000 | (29,268,000) | 123,585,000
Effective tax rate (as a percent) | 38.60% | 35.00% | 36.50%
Excess income tax benefit from the exercise of stock awards | 0 |  |
Deferred Income Taxes [Abstract] |  |  |
Deferred Tax Liabilities, Oil and Gas Properties | 768,463,000 | 678,624,000 |
Deferred Tax Liabilities, Derivative asset | 9,529,000 | 15,942,000 |
Deferred Tax Liabilities, Other | 1,245,000 | 6,443,000 |
Deferred Tax Liabilities | 779,237,000 | 701,009,000 |
Deferred Tax Assets, Federal and state tax net operating loss carryovers | 91,788,000 | 113,522,000 |
Deferred Tax Assets, Net Profits Plan Liability | 20,913,000 | 29,233,000 |
Deferred Tax Assets, Stock compensation | 18,820,000 | 18,026,000 |
Deferred Tax Assets, Other Long-term Liabilities | 13,341,000 | 16,739,000 |
Deferred Tax Assets, Gross | 144,862,000 | 177,520,000 |
Deferred Tax Assets, Valuation Allowance | (5,001,000) | (5,315,000) |
Deferred Tax Assets, Net | 139,861,000 | 172,205,000 |
Deferred Tax Liabilities, Net | 639,376,000 | 528,804,000 |
Less: current deferred income tax liabilities | (172,000) | (5,442,000) |
Add: current deferred income tax assets | 10,921,000 | 14,021,000 |
Deferred income taxes; Net, non-current | 650,125,000 | 537,383,000 |
Income Taxes Receivable, Current | 4,630,000 | 3,364,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 376,100,000 |  |
Unrecognized Tax Benefits, Exercise of Stock Awards | 126,700,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 147,500,000 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 5,000,000 |  |
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Federal statutory tax expense (benefit) | 97,514,000 | (29,231,000) | 118,652,000
State tax expense (benefit) (net of federal benefit) | 9,400,000 | (992,000) | 6,458,000
Research and development credit | 0 | (970,000) | (4,516,000)
Change in valuation allowance | (314,000) | 1,524,000 | 1,627,000
Statutory depletion | (154,000) | (210,000) | (341,000)
Other | 1,230,000 | 611,000 | 1,705,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Beginning Balance | 2,278,000 | 1,961,000 | 807,000
Unrecognized Tax Benefits, Additions based on tax positions related to current year | 0 | 0 | 1,172,000
Unrecognized Tax Benefits, Additions For Tax Positions Of Prior Years | 80,000 | 317,000 | 183,000
Unrecognized Tax Benefits,Reductions For Lapse Of Statute Of Limitations | 0 | 0 | (201,000)
Unrecognized Tax Benefits, Ending Balance | 2,358,000 | 2,278,000 | 1,961,000
Internal Revenue Service (IRS) [Member] |  |  |
Deferred Income Taxes [Abstract] |  |  |
Income Taxes Receivable, Current | 4,630,000 | 2,511,000 |
State and Local Jurisdiction [Member] |  |  |
Deferred Income Taxes [Abstract] |  |  |
Income Taxes Receivable, Current | 0 | 853,000 |
Taxes Payable, Current | 1,460,000 | 0 |
Unrecognized Tax Benefit Possible Change, Minimum [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Ending Balance | 0 |  |
Unrecognized Tax Benefit Possible Change, Maximum [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 1,400,000 |  |

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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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