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Derivatives (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Gain (loss) on derivative        
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges $ 0 $ 0 $ 0 $ 0
Derivatives instruments designated as hedging instruments | Fair value hedges
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) on Hedge     7,593 (29,296)
Derivatives instruments designated as hedging instruments | Fair value hedges | Hedged items
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) on Hedged Item     (7,224) 41,734
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)
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
Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue | Inventories
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) on Hedged Item 10,937 44,615 (7,224) 41,196
Derivatives instruments not designated as hedging instruments
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (2,029) (521) 25,474 10,865
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) on Hedge       265
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 (12,032) (38,337) 7,593 (28,144)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) 6,589 30,928 26,096 14,156
Commodity contracts | Derivatives instruments not designated as hedging instruments | Cost of revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (521) (29,272) 893 298
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges
        
Gain (loss) on derivative        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) 33 127 9 127
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges | Other (expense) income, net
        
Gain (loss) on derivative        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) 47 13 119 13
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (1,992) (1,392) 748 (2,120)
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Other (expense) income, net
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (6,105) (785) (2,263) (1,469)
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)