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Derivatives (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Derivatives instruments designated as hedging instruments | Fair value hedges
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) on Hedge $ (21,357,000) $ (3,262,000) $ (18,314,000)
Derivatives instruments designated as hedging instruments | Fair value hedges | Hedged items
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) on Hedged Item 33,175,000 13,128,000 21,071,000
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 (12,973,000) (7,494,000) (14,227,000)
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 7,771,000 (797,000) 12,193,000
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 38,377,000 21,419,000 23,105,000
Derivatives instruments designated as hedging instruments | Cash flow hedges
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss)   1,026,000 140,000
Unrealized Gain (Loss) Recorded in Accumulated Other Comprehensive Income (Effective Portion)   1,718,000 1,614,000
Realized net gain (loss) being reclassified from accumulated other comprehensive income to cost of revenue due to ineffective derivative instrument   700,000  
Derivatives instruments not designated as hedging instruments
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) 18,687,000 5,920,000 7,260,000
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) on Hedge 11,608,000 10,040,000 14,117,000
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 (6,926,000) (739,000) (13,162,000)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) 14,283,000 4,385,000 3,590,000
Commodity contracts | Derivatives instruments not designated as hedging instruments | Cost of revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) 3,137,000 (1,001,000) 2,087,000
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges
      
Gain (loss) on derivative      
Unrealized Gain (Loss) Recorded in Accumulated Other Comprehensive Income (Effective Portion)   1,799,000 (39,000)
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss)   1,107,000 (38,000)
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges | Cost of revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss)     131,000
Foreign currency contracts | Derivatives instruments designated as hedging instruments | Cash flow hedges | Other (expense) income, net
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss)   (81,000) 47,000
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Revenue
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) 1,653,000    
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Other (expense) income, net
      
Gain (loss) on derivative      
Realized and Unrealized Gain (Loss) (386,000) 2,536,000 1,583,000
Foreign exchange contracts. | Derivatives instruments designated as hedging instruments | Cash flow hedges
      
Gain (loss) on derivative      
Unrealized Gain (Loss) Recorded in Accumulated Other Comprehensive Income (Effective Portion)     631,000
Foreign exchange contracts... | Derivatives instruments designated as hedging instruments | Cash flow hedges
      
Gain (loss) on derivative      
Unrealized Gain (Loss) Recorded in Accumulated Other Comprehensive Income (Effective Portion)   (81,000) 1,022,000
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 $ (26,039,000) $ (12,563,000) $ (19,269,000)