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Derivatives (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Gain (loss) on derivative    
Collateral posted and the amount of assets required to be posted $ 2,300,000  
Derivatives instruments designated as hedging instruments | Fair value hedges
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedge (27,481,000) (37,033,000)
Derivatives instruments designated as hedging instruments | Fair value hedges | Hedged items
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedged Item 29,966,000 43,945,000
Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue | Hedged item commitments
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedged Item (201,000) (11,433,000)
Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue | Hedged item commitments
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedged Item 739,000 8,037,000
Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue | Hedged item inventories
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedged Item 29,428,000 47,341,000
Derivatives instruments not designated as hedging instruments
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) 3,584,000 312,000
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedge 265,000 10,687,000
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedge (1,417,000) (7,461,000)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Revenue
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) (223,000) 1,558,000
Commodity contracts | Derivatives instruments not designated as hedging instruments | Cost of revenue
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) 7,021,000 663,000
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Revenue
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) (1,552,000)  
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Other income (expense), net
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) (1,662,000) (1,909,000)
Commodity contracts. | Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue
    
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedge $ (26,329,000) $ (40,259,000)