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Acquisitions and Divestitures - Arena Acquisition - Final Valuation of Assets Acquired and Liabilities Assumed (Parenthetical) (Details) (Arena Acquisition, USD $) In Thousands, unless otherwise specified | 0 Months Ended
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Jul. 16, 2010
Business Acquisition [Line Items] |
Weighted average commodity prices, basis of price determination | The prices utilized were based upon forward commodity strip prices, as of July 16, 2010, for the first four years and escalated for inflation at a rate of 2.5% annually beginning with the fifth year through the end of production, which was more than 50 years.
Commodity prices period valuation before escalation | 4 years
Annual escalation factor for forward commodity strip prices beginning the fifth year through end of production | 2.50%
Fair value allocated to oil and natural gas properties attributed to oil reserves | 91.00%
Purchase price allocation, net deferred tax liability | $ 454,500
Oil |
Business Acquisition [Line Items] |
Commodity average price (in dollars per bbl for oil/dollars per mcf for natural gas) | 105.58
Natural Gas |
Business Acquisition [Line Items] |
Commodity average price (in dollars per bbl for oil/dollars per mcf for natural gas) | 8.56

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- Definition Amount of acquisition cost of a business combination allocated to noncurrent deferred tax assets net of valuation allowance and noncurrent deferred tax liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 38 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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