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Derivatives (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Gain (loss) on derivative    
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges $ 0 $ 0
Derivatives instruments designated as hedging instruments | Fair value hedges
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedge 5,079 (27,481)
Derivatives instruments designated as hedging instruments | Fair value hedges | Hedged items
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) on Hedged Item 893 29,966
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 893 29,428
Derivatives instruments not designated as hedging instruments
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) 11,249 3,584
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   (1,417)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Revenue
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) 5,395 (223)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Cost of revenue
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) (293) 7,021
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) (51)  
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges | Other income (expense), net
   
Gain (loss) on derivative    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion) 39  
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Revenue
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) 2,668 (1,552)
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Other income (expense), net
   
Gain (loss) on derivative    
Realized and Unrealized Gain (Loss) 3,479 (1,662)
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 $ 5,079 $ (26,329)