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Derivative Accounting (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Commodity Contracts
   
Assets    
Amount Reported on Balance Sheet $ 54,000  
Assets and Liabilities    
Gross Recognized Derivatives (108,675) (122,252)
Amounts Offset 28,700 49,299
Net Recognized Derivatives (79,975) (72,953)
Other (18,861) (24,462)
Amount Reported on Balance Sheet (98,836) (97,415)
Commodity Contracts | Current Assets
   
Assets    
Gross Recognized Derivatives 32,642 42,495
Amounts Offset (10,669) (17,797)
Net Recognized Derivatives 21,973 24,698
Other 602 1,001
Amount Reported on Balance Sheet 22,575 25,699
Commodity Contracts | Investments and Other Assets
   
Assets    
Gross Recognized Derivatives 34,486 41,563
Amounts Offset (2,568) (5,672)
Net Recognized Derivatives 31,918 35,891
Amount Reported on Balance Sheet 31,918 35,891
Commodity Contracts | Total Assets
   
Assets    
Gross Recognized Derivatives 67,128 84,058
Amounts Offset (13,237) (23,469)
Net Recognized Derivatives 53,891 60,589
Other 602 1,001
Amount Reported on Balance Sheet 54,493 61,590
Commodity Contracts | Current Liabilities
   
Liabilities    
Gross Recognized Derivatives (82,710) (105,324)
Amounts Offset 34,318 57,046
Net Recognized Derivatives (48,392) (48,278)
Other (19,463) (25,463)
Amount Reported on Balance Sheet (67,855) (73,741)
Commodity Contracts | Deferred Credits and Other
   
Liabilities    
Gross Recognized Derivatives (93,093) (100,986)
Amounts Offset 7,619 15,722
Net Recognized Derivatives (85,474) (85,264)
Amount Reported on Balance Sheet (85,474) (85,264)
Commodity Contracts | Total Liabilities
   
Liabilities    
Gross Recognized Derivatives (175,803) (206,310)
Amounts Offset 41,937 72,768
Net Recognized Derivatives (133,866) (133,542)
Other (19,463) (25,463)
Amount Reported on Balance Sheet (153,329) (159,005)
Designated as Hedging Instruments
   
Liabilities    
Amount Reported on Balance Sheet $ 5,000 $ 5,000