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Quarterly Financial Results (Unaudited) Quarterly Financial Results (Unaudited) (Parenthetical) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | $ 235,400,000 |  |  |  |  | $ 235,400,000 |
Asset impairment charges |  |  |  |  |  |  |  |  | 26,280,000 | 316,004,000 | 2,825,000
Loss (gain) on derivative contracts |  |  |  |  |  |  |  |  | 47,123,000 | (241,419,000) | (44,075,000)
Drilling Assets |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | 10,600,000 |  |  |  |  |  | 11,100,000 |  |
Gas Treating Plants and CO2 Compression Facilities |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  | 79,300,000 |  |  |  |  |  |
Corporate Asset |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | 2,900,000 |  |  |  |  |  |  |  |
Gas Treating Plants and other Midstream Assets |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 10,000,000 |  | 2,100,000 |  |  |  |  |  | 12,200,000 |  |
Dynamic Acquisition |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, measurement period adjustment |  |  |  |  |  |  | (4,800,000) |  |  |  |
Exploration and Production |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  |  |  |  |  |  | 235,400,000 |
Commodity Derivatives |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on derivative contracts | (22,900,000) | 132,800,000 | (103,700,000) | 40,900,000 | (19,600,000) | 193,500,000 | (669,900,000) | 254,600,000 | 47,123,000 | (241,419,000) | (44,075,000)
Permian Properties |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on divestiture |  |  |  |  |  |  |  |  | $ (398,900,000) |  |

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