Derivatives (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (48,620)	$ (16,910)	$ (22,679)	$ 34,902
Interest rate contracts | Not Designated as Hedging Instrument | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	652	0	(1,642)	0
Foreign currency contract | Not Designated as Hedging Instrument | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (261)	$ 0	$ 1,130	$ 0