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Derivative Accounting (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Liabilities    
Amount Reported on Balance Sheet $ (102,207) $ (159,005)
Commodity Contracts
   
Assets    
Amount Reported on Balance Sheet 41,000  
Assets and Liabilities    
Gross Recognized Derivatives (72,712) (122,252)
Amounts Offset 19,000 49,299
Net Recognized Derivatives (53,712) (72,953)
Other (7,511) (24,462)
Amount Reported on Balance Sheet (61,223) (97,415)
Commodity Contracts | Current Assets
   
Assets    
Gross Recognized Derivatives 24,587 42,495
Amounts Offset (7,425) (17,797)
Net Recognized Derivatives 17,162 24,698
Other 7 1,001
Amount Reported on Balance Sheet 17,169 25,699
Commodity Contracts | Investments and Other Assets
   
Assets    
Gross Recognized Derivatives 25,364 41,563
Amounts Offset (1,549) (5,672)
Net Recognized Derivatives 23,815 35,891
Amount Reported on Balance Sheet 23,815 35,891
Commodity Contracts | Total Assets
   
Assets    
Gross Recognized Derivatives 49,951 84,058
Amounts Offset (8,974) (23,469)
Net Recognized Derivatives 40,977 60,589
Other 7 1,001
Amount Reported on Balance Sheet 40,984 61,590
Commodity Contracts | Current Liabilities
   
Liabilities    
Gross Recognized Derivatives (50,540) (105,324)
Amounts Offset 26,166 57,046
Net Recognized Derivatives (24,374) (48,278)
Other (7,518) (25,463)
Amount Reported on Balance Sheet (31,892) (73,741)
Commodity Contracts | Deferred Credits and Other
   
Liabilities    
Gross Recognized Derivatives (72,123) (100,986)
Amounts Offset 1,808 15,722
Net Recognized Derivatives (70,315) (85,264)
Amount Reported on Balance Sheet (70,315) (85,264)
Commodity Contracts | Total Liabilities
   
Liabilities    
Gross Recognized Derivatives (122,663) (206,310)
Amounts Offset 27,974 72,768
Net Recognized Derivatives (94,689) (133,542)
Other (7,518) (25,463)
Amount Reported on Balance Sheet (102,207) (159,005)
Designated as Hedging Instruments
   
Liabilities    
Amount Reported on Balance Sheet $ 5,000 $ 5,000