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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Earnings	$ (371)	$ (83)	$ (413)	$ (26)
Foreign Exchange Contracts | Other Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Earnings	$ (371)	$ (83)	$ (413)	$ (26)