Derivative Instruments and Hedging Activities - Amount of (Gain) Loss in Income on Derivatives (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gains and losses on derivative instruments
Amount of (Gain) Loss Recognized in Income on Derivatives	$ (8,119)	$ 11,748	$ 20,414	$ 14,670
Foreign exchange contracts | Other (income) expense, net
Gains and losses on derivative instruments
Amount of (Gain) Loss Recognized in Income on Derivatives	$ (8,119)	$ 11,748	$ 20,414	$ 14,670