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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]  
Inventory
      September 30,       September 30,  
       December 31,  
       2011        2010  
       (In thousands)  

Equipment and materials

      $ 2,709         $ 640   

Crude oil inventory

        834           683   
      

 

 

       

 

 

  
       $ 3,543         $ 1,323
Net Changes In Capitalized Exploratory Well Costs
      September 30,       September 30,       September 30,  
       December 31,  
       2011      2010      2009  
       (In thousands)  

Beginning of period

      $ 5,176       $ 427       $ 324   

Exploratory well cost additions (pending determination of proved reserves)

        73,947         39,708         72,972   

Exploratory well cost reclassifications (successful determination of proved reserves)

        (57,646 )       (34,959 )       (72,869 ) 

Exploratory well dry hole costs (unsuccessful in adding proved reserves)

        (1,270 )       —           —     
      

 

 

     

 

 

     

 

 

  

End of period

      $ 20,207       $ 5,176       $ 427