Derivative Financial Instruments (Schedule Of Derivative Instruments Fair Value And Balance Sheet Classification) (Details) - Forward exchange contracts [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Prepaid And Other Current Assets [Member]
Derivative instruments in asset positions, Forward exchange contracts	$ 118	$ 1,165
Other Long-Term Assets [Member]
Derivative instruments in asset positions, Forward exchange contracts	1	$ 116
Accounts Payable And Accrued Liabilities [Member]
Derivative instruments in liability positions, Forward exchange contracts	551
Other Long-Term Liabilities [Member]
Derivative instruments in liability positions, Forward exchange contracts	$ 62