XML 66 R111.htm IDEA: XBRL DOCUMENT v2.4.0.6
Commitments and Contingencies - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leases
      
Commitments and Contingencies Disclosure [Line Items]      
Total rental expense under operating leases $ 2,600,000 $ 1,500,000 $ 2,600,000
Rig Commitments
      
Commitments and Contingencies Disclosure [Line Items]      
Minimum future commitments, 2013 44,200,000    
Minimum future commitments, 2014 9,700,000    
Hyrdaulic Services Agreements
      
Commitments and Contingencies Disclosure [Line Items]      
Termination fee 33,400,000    
Gas Gathering Agreement
      
Commitments and Contingencies Disclosure [Line Items]      
Minimum future commitments, 2013 42,634,000    
Minimum future commitments, 2014 42,360,000    
Treating Agreement
      
Commitments and Contingencies Disclosure [Line Items]      
Contract agreement, term 30 years    
Minimum delivery required (in Bcf) 3,200    
Accrued shortfall 8,500,000    
Treating Agreement | Minimum
      
Commitments and Contingencies Disclosure [Line Items]      
Range of projected shortfall in one year 29,500,000    
Treating Agreement | Maximum
      
Commitments and Contingencies Disclosure [Line Items]      
Range of projected shortfall in one year 36,000,000    
Aspen Pipeline, II, L.P.
      
Commitments and Contingencies Disclosure [Line Items]      
Damages sought by plaintiff 100,000,000    
Settlement amount 20,000,000    
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP
      
Commitments and Contingencies Disclosure [Line Items]      
Damages sought by plaintiff 45,500,000    
General Land Office of the State of Texas
      
Commitments and Contingencies Disclosure [Line Items]      
Damages sought by plaintiff 13,000,000    
Patriot Exploration, LLC, Jonathan Feldman, Redwing Drilling Partners, Mapleleaf Drilling Partners, Avalanche Drilling Partners, Penguin Drilling Partners and Gramax Insurance Company Ltd.
      
Commitments and Contingencies Disclosure [Line Items]      
Plaintiffs investment under participation agreement 15,000,000    
Pinon Gathering Company LLC | Gas Gathering Agreement
      
Commitments and Contingencies Disclosure [Line Items]      
Agreement expiration date Jun. 30, 2029    
Grey Ranch Plant, L.P
      
Commitments and Contingencies Disclosure [Line Items]      
Insurance recoveries from damages caused by the fire 24,500,000    
Ownership interest 50.00%    
Estimate of reasonably possible losses for claims associated with Grey Ranch Plant $ 1,100,000