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Divestitures - Narrative (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Gulf Properties - USD ($) | Feb. 25, 2014 | Mar. 31, 2015 | Dec. 31, 2014
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sale of oil and natural gas properties | $ 702,600,000 |  |
Gain (loss) on sale of oil and gas property | $ 0 |  |
Contingent consideration liability, guarantee period | 1 year |  |
Contingent consideration, liability | $ 9,400,000 |  | $ 5,100,000
Restricted deposits previously held in escrow, cash received |  | $ 12,000,000 |
Asset Retirement Obligations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset retirement obligations assumed | $ 366,000,000 |  |

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