Derivatives (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 34,800	$ (41,017)	$ 25,941	$ 2,805
Interest rate contracts | Not Designated as Hedging Instrument | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	(694)	0	(2,294)	0
Foreign currency contract | Not Designated as Hedging Instrument | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (87)	$ 0	$ 1,391	$ 0