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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings	$ (2)	$ (787)	$ (42)	$ 57
Foreign Exchange Contracts | Other Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Earnings	$ (2)	$ (787)	$ (42)	$ 57