Derivative Instruments and Hedging Activities (Fair Value of Derivatives) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Foreign exchange options | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 0	$ 1,792
Foreign exchange forwards
Derivatives, Fair Value [Line Items]
Derivative Liability		0
Foreign exchange forwards | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Liability	1
Foreign exchange forwards | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 0	$ 14