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Divestitures - Narrative (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Gulf Properties - USD ($)	Feb. 25, 2014	Jun. 30, 2015	Dec. 31, 2014
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	$ 3,700,000	$ 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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