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Hedge Contracts (Tables)
6 Months Ended
Jun. 30, 2012
Hedge Contracts (Tables)  
Pretax Gain (Loss) on Derivative Instruments Table
   
Three Months Ended June 30, 2011
 
Derivative Swap Contracts
 
Oil
  
Natural Gas
  
Total
 
   
(In Thousands)
 
Amount of pretax gain reclassified from accumulated other comprehensive
       
  income into product sales revenue (effective portion)
 $-  $-  $- 
Amount of pretax gain (loss) from change in derivative fair value
            
  recognized in other comprehensive income
  -   -   - 
Amount of pretax gain (loss) recognized in other income (expense)
         
  (ineffective portion)
  (14,224)  -   (14,224)
 
   
Six Months Ended June 30, 2011
 
Derivative Swap Contracts
 
Oil
  
Natural Gas
  
Total
 
   
(In Thousands)
 
Amount of pretax gain reclassified from accumulated other comprehensive
       
  income into product sales revenue (effective portion)
 $1,177  $-  $1,177 
Amount of pretax gain (loss) from change in derivative fair value
            
  recognized in other comprehensive income
  (7,854)  -   (7,854)
Amount of pretax gain (loss) recognized in other income (expense)
         
  (ineffective portion)
  (13,947)  -   (13,947)