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Properties and Equipment, Net (Details 4) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Pearsall shale
May 31, 2011
Haynesville/Bossier Shale Joint Ventures
Dec. 31, 2011
Haynesville/Bossier Shale Joint Ventures
agreement
Oct. 31, 2011
Colorado, Utah and Wyoming properties
Dec. 31, 2010
Pennsylvania gathering infrastructure
item
mi
Nov. 30, 2010
Sale of Canadian Property
Tourmaline Oil Corporation common stock
Dec. 31, 2012
Other properties
Dec. 31, 2011
Other properties
Dec. 31, 2010
Other properties
Dec. 31, 2012
Texas oil and gas properties
Significant Acquisitions and Disposals                          
Gain (loss) on sale of assets $ 50,635,000 $ 63,382,000 $ 106,294,000 $ 67,000,000 $ 34,200,000   $ 4,200,000 $ 49,300,000 $ 40,700,000 $ 1,800,000 $ 25,000,000 $ 16,300,000 $ 18,200,000
Proceeds from sale of oil and gas properties before closing adjustments             285,000,000           29,900,000
Non-operated working interest (as a percent)       35.00%                  
Total consideration received from the sale of properties       251,000,000           14,400,000      
Proceeds from sale of oil and gas properties       125,000,000 47,000,000   283,200,000 150,000,000     73,500,000 32,200,000  
Accrual amount included in the gain (loss) on sale of assets               17,900,000          
Gain on sale of investment in common stock of Tourmaline                 61,300,000        
Participation agreements           2              
Percentage of fund for the Company's share of future drilling and completion costs       85.00%                  
Future drilling and completion costs to be funded by third party       126,000,000                  
Drilling and completion carry       2 years                  
Third party reimbursement percentage of drilling costs           100.00%              
Third party percentage of working interest in leaseholds           75.00%              
Reimbursement of drilling costs by third parties           $ 12,900,000              
Miles of pipeline sold to Williams Field Services               75          
Number of compressor stations sold to Williams Field Services               2