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Derivatives (Details 3) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Gain (loss) on derivative        
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges $ 0 $ 0 $ 0 $ 0
Gains or losses, which were excluded from the assessment of the effectiveness of cash flow hedges 0 0 0 0
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue.        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) on Hedge (20,100) (2,100) (16,100) (1,700)
Realized and Unrealized Gain (Loss) on Hedged Item 19,800 (1,100) 19,300 (8,600)
Derivatives not designated as hedging instruments        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (400) 13,000 21,600 28,500
Derivatives not designated as hedging instruments | Commodity contracts | Revenue        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) 25,400 17,200 46,000 24,100
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue.        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (16,400) (600) (28,100) 9,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) (5,200) (1,000) (1,300) (1,300)
Derivatives not designated as hedging instruments | Foreign currency contracts | Other income (expense), net        
Gain (loss) on derivative        
Realized and Unrealized Gain (Loss) $ (4,200) $ (2,600) $ 5,000 $ (3,300)