Foreign Currency Derivatives - Effect of Non-Designated Hedges in Condensed Consolidated Statements of Operations (Details) (Interest and other income (expense), net, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest and other income (expense), net
Derivative Instruments Gain Loss [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 3,991	$ (1,783)	$ 4,290	$ (182)