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Derivatives (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on derivative instruments $ (8,859) $ 43,822
Interest rate contracts | Not Designated as Hedging Instrument | Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on derivative instruments (1,600) 0
Foreign currency contract | Not Designated as Hedging Instrument | Other income, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on derivative instruments $ 1,478 $ 0