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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Summary Of Estimated Fair Value Derivative Financial Instruments
     September 30, 2011  

(in thousands)

   Level 1      Level 2      Level 3      Total  

Oil and natural gas derivative financial instruments

   $ —         $ 136,812       $ —         $ 136,812   
  

 

 

    

 

 

    

 

 

    

 

 

 
     December 31, 2010  

(in thousands)

   Level 1      Level 2      Level 3      Total  

Oil and natural gas derivative financial instruments

   $ —         $ 88,923       $ —         $ 88,923