Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 12,502
Total change in hedge fair value recorded in Other Comprehensive Income			(8)
Amounts reclassified from accumulated other comprehensive income			181
Net change related to derivatives	$ 57	$ 63	173	$ (142)
Net current-period other comprehensive income (loss)			(8,166)
Balance	4,336		4,336
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			14,966
Net current-period other comprehensive income (loss)			(8,494)
Balance	6,472		6,472
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(12)
Net current-period other comprehensive income (loss)			(1)
Balance	(13)		(13)
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,135)
Net current-period other comprehensive income (loss)			156
Balance	(1,979)		(1,979)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(317)
Total change in hedge fair value recorded in Other Comprehensive Income			(8)
Amounts reclassified from accumulated other comprehensive income			181
Net change related to derivatives			173
Net current-period other comprehensive income (loss)			173
Balance	$ (144)		$ (144)