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Acquisitions and Divestitures - Divestitures (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 25, 2014 | Feb. 26, 2013 | Dec. 31, 2013 | Mar. 31, 2015 | Dec. 31, 2014
Gulf Properties |  |  |  |  |
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 |  |  |  |
Guarantee period for certain plugging and abandonment obligations (up to) | 1 year |  |  |  |
Contingent liability equal to fair value of guarantees recorded as part of sale | $ 9,400,000 |  |  |  | $ 5,100,000
Restricted deposits previously held in escrow, cash received |  |  |  | $ 12,000,000 |
Loss on sale of oil and gas property | 0 |  |  |  |
Permian Properties |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of oil and natural gas properties |  | $ 2,600,000,000 |  |  |
Loss on sale of oil and gas property |  |  | $ 398,900,000 |  |
Permian Properties | Non-controlling Interest |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on sale of oil and gas property |  |  | $ 71,700,000 |  |
Asset Retirement Obligations | Gulf Properties |  |  |  |  |
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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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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