Derivatives (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 27,025	$ (8,859)
Interest rate contracts | Not Designated as Hedging Instrument | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	389	(1,600)
Foreign currency contract | Not Designated as Hedging Instrument | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 98	$ 1,478