Derivative Instruments And Hedging Activities - Impact Of Derivative Instruments Not Designated As Hedging Instruments On Condensed Consolidated Statements Of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings	$ (40)	$ 844
Foreign Exchange Contracts | Other Income, Net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings	$ (40)	$ 844