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Derivative Accounting (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Commodity Contracts
   
Assets    
Amount Reported on Balance Sheet $ 54,000  
Assets and Liabilities    
Gross Recognized Derivatives (93,537) (122,252)
Amounts Offset 25,096 49,299
Net Recognized Derivatives (68,441) (72,953)
Other (25,396) (24,462)
Amount Reported on Balance Sheet (93,837) (97,415)
Commodity Contracts | Current Assets
   
Assets    
Gross Recognized Derivatives 38,623 42,495
Amounts Offset (18,344) (17,797)
Net Recognized Derivatives 20,279 24,698
Other 67 1,001
Amount Reported on Balance Sheet 20,346 25,699
Commodity Contracts | Investments and Other Assets
   
Assets    
Gross Recognized Derivatives 39,467 41,563
Amounts Offset (5,420) (5,672)
Net Recognized Derivatives 34,047 35,891
Amount Reported on Balance Sheet 34,047 35,891
Commodity Contracts | Total Assets
   
Assets    
Gross Recognized Derivatives 78,090 84,058
Amounts Offset (23,764) (23,469)
Net Recognized Derivatives 54,326 60,589
Other 67 1,001
Amount Reported on Balance Sheet 54,393 61,590
Commodity Contracts | Current Liabilities
   
Liabilities    
Gross Recognized Derivatives (78,412) (105,324)
Amounts Offset 38,521 57,046
Net Recognized Derivatives (39,891) (48,278)
Other (25,463) (25,463)
Amount Reported on Balance Sheet (65,354) (73,741)
Commodity Contracts | Deferred Credits and Other
   
Liabilities    
Gross Recognized Derivatives (93,215) (100,986)
Amounts Offset 10,339 15,722
Net Recognized Derivatives (82,876) (85,264)
Amount Reported on Balance Sheet (82,876) (85,264)
Commodity Contracts | Total Liabilities
   
Liabilities    
Gross Recognized Derivatives (171,627) (206,310)
Amounts Offset 48,860 72,768
Net Recognized Derivatives (122,767) (133,542)
Other (25,463) (25,463)
Amount Reported on Balance Sheet (148,230) (159,005)
Designated as Hedging Instruments
   
Liabilities    
Amount Reported on Balance Sheet $ (5,000) $ (5,000)