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Derivatives (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Gain (loss) on derivative      
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges $ 0 $ 0 $ 0
Gains or losses, which were excluded from the assessment of the effectiveness of cash flow hedges 0 0 0
Derivatives instruments designated as hedging instruments | Fair value hedges
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) on Hedge 2,685 (20,869) (21,357)
Derivatives instruments designated as hedging instruments | Fair value hedges | Hedged items
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) on Hedged Item 3,059 24,510 33,175
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) (12,973)
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 7,771
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 3,059 23,972 38,377
Derivatives instruments not designated as hedging instruments
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) 15,976 13,645 18,687
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) on Hedge   265 11,608
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 2,685 (19,717) (26,039)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) 25,420 14,967 14,283
Commodity contracts | Derivatives instruments not designated as hedging instruments | Cost of revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) (5,391) 3,333 3,137
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges
      
Gain (loss) on derivative      
Amount of Gain Recognized in Accumulated Other Comprehensive Income (Effective Portion) 11 196  
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges | Other (expense) income, net
      
Gain (loss) on derivative      
Amount of Gain Reclassified from Accumulated Other Comprehensive Income (Effective Portion) 159 48  
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) (55) (2,384) 1,653
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Other (expense) income, net
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) (3,998) (2,271) (386)
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) $ (6,926)