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Fair Value Measurements on a Recurring Basis (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Disclosures [Abstract] 
Fair Value, Measurement Inputs, Disclosure [Text Block]
The following presents the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis:
 
   
September 30, 2011
   
Level 2
 
Netting (1)
 
Total
   
(in thousands)
 
Assets:
         
Commodity derivatives
 $980,187  $(203,774) $776,413 
              
Liabilities:
            
Commodity derivatives
 $210,654  $(203,774) $6,880 
 
(1)
Represents counterparty netting under agreements governing such derivatives.