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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)