Derivative Financial Instruments (Schedule Of Derivative Instruments Fair Value And Balance Sheet Classification) (Details) - Forward exchange contracts [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Prepaid And Other Current Assets [Member]
Derivative instruments in asset positions, Forward exchange contracts	$ 16
Accounts Payable And Accrued Liabilities [Member]
Derivative instruments in liability positions, Forward exchange contracts	$ 289	$ 1,539
Other Long-Term Liabilities [Member]
Derivative instruments in liability positions, Forward exchange contracts		$ 90