Derivative Financial Instruments (Schedule Of Derivative Instruments Fair Value And Balance Sheet Classification) (Details) - Forward exchange contracts [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid And Other Current Assets [Member]
Derivative instruments in asset positions, Forward exchange contracts	$ 89	$ 226
Other Long-Term Assets [Member]
Derivative instruments in asset positions, Forward exchange contracts	36
Accounts Payable And Accrued Liabilities [Member]
Derivative instruments in liability positions, Forward exchange contracts	$ 813	152
Other Long-Term Liabilities [Member]
Derivative instruments in liability positions, Forward exchange contracts		$ 29