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Derivatives (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
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 | Commodity contracts | Cost of revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain on Hedge (2,093) 14,546 (1,701) 19,625
Derivatives instruments designated as hedging instruments | Fair value hedges | Inventories | Cost of revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) on Hedged Item (1,083) (19,053) (8,642) (18,161)
Derivatives instruments not designated as hedging instruments
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) 12,983 16,253 28,526 27,502
Derivatives instruments not designated as hedging instruments | Commodity contracts | Revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) 17,225 14,112 24,143 19,507
Derivatives instruments not designated as hedging instruments | Commodity contracts | Cost of revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (598) 1,706 9,045 1,413
Derivatives instruments not designated as hedging instruments | Foreign currency contracts | Revenue
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (1,053) 72 (1,337) 2,740
Derivatives instruments not designated as hedging instruments | Foreign currency contracts | Other income (expense), net
        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) $ (2,591) $ 363 $ (3,325) $ 3,842