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Commitments and Contingencies (Details)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2011
Sixth Amended Petition [Member]
USD ($)
Dec. 31, 2010
Seventh Amended Petition [Member]
USD ($)
Dec. 31, 2011
Post Verdict Motions [Member]
USD ($)
Dec. 31, 2011
Compressors Aircraft Office Space and Equipment [Member]
USD ($)
Dec. 31, 2011
Midstream Services and E&P [Member]
USD ($)
Dec. 31, 2011
SES [Member]
USD ($)
Dec. 31, 2011
Canada [Member]
USD ($)
Dec. 31, 2011
Canada [Member]
CAD
Future Demand Transportation Charges Due 2012 $ 212,200,000                
Future Demand Transportation Charges Due 2013 218,800,000                
Future Demand Transportation Charges Due 2014 234,300,000                
Future Demand Transportation Charges Due 2015 233,700,000                
Future Demand Transportation Charges Due 2016 236,200,000                
Future Demand Transportation Charges Due After 2016 960,500,000                
Aggregate annual lease payment for the 14 leased drilling rigs and equipment 19,400,000                
Operating leases, future minimum payments due 2012         69,900,000 42,100,000      
Operating leases, future minimum payments due 2013         65,000,000 30,000,000      
Operating leases, future minimum payments due 2014         57,700,000 15,700,000      
Operating leases, future minimum payments due 2015         33,500,000 9,600,000      
Operating leases, future minimum payments due 2016         25,900,000 8,000,000      
Operating leases, future minimum payments due Thereafter         16,200,000 1,700,000      
Dekatherm per day of capacity             100,000    
Obligations for demand and similar charges under transportation agreements             2,100,000,000    
ExpectedCapacity 275,000                
Unrecorded capital investments obligation, Exploration program acres coverage                 2.5
Unrecorded capital investments obligation                 47,000,000
Unrecorded promissory note payable                 44,500,000
Capital investment related to companys E&P segment related to Canada               28,500,000  
Litigation, Monetary damages claimed by plaintiffs   55,000,000 46,000,000            
Litigation, Management's assessment

We are subject to various litigation, claims and proceedings that have arisen in the ordinary course of business. Management believes, individually or in aggregate, such litigation, claims and proceedings will not have a material adverse impact on our financial position or our results of operations but these matters are subject to inherent uncertainties and management's view may change in the future. If an unfavorable final outcome were to occur, there exists the possibility of a material impact on our financial position, results of operations or cash flows for the period in which the effect becomes reasonably estimable. We accrue for such items when a liability is both probable and the amount can be reasonably estimated.

                
Litigation settlement, gross     11,400,000            
Litigation, portion of profits considered for disgorgement     381,500,000            
Disgorgement damages awarded in favor of the plaintiff       11,400,000          
Disgorgement damages awarded in favor of the plantiff and intervenor 23,900,000                
Percentage of attorney fees recoverable by plantiff       40          
Attorney fees due to plantiff 8,900,000                
Number of wells for constructive trust profits       143          
Number of horizontal wells operated by SEECO in Arkansas 27                
Value of SEPCO's supersedeas bond 14,100,000                
Actual damages covered by SEPCO's supersedeas bond 11,400,000                
Pre-judgement interest covered by SEPCO's supersedeas bond 1,300,000                
Post-judgement interest covered by SEPCO's supersedeas bond 1,300,000                
Litigation, SEPCO's estimated gross liability including interest and attorney's fees. $ 44,200,000