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Property, Pland and Equipment - Additional Information (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Property, Plant and Equipment |  |  |
Cumulative full cost ceiling limitation impairment | $ 3,700,000,000 |  | $ 3,500,000,000
Impairment | 164,779,000 | 0 |
Repsol E&P USA, Inc. |  |  |
Property, Plant and Equipment |  |  |
Drilling carry received or billed | 72,300,000 |  |
Atinum MidCon I, LLC and Repsol E&P USA, Inc. |  |  |
Property, Plant and Equipment |  |  |
Drilling carry received or billed |  | $ 123,300,000 |

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- Definition Drilling Carry Received or Billed. + References No definition available. + Details
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- Definition Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation. + References No definition available. + Details
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- Details
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- Definition The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 4(ii) -Article 4 + Details
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