Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 5,589
Total change in hedge fair value recorded in Other Comprehensive Income			(282)
Amounts reclassified from accumulated other comprehensive income			140
Net change related to derivatives	$ 63	$ (20)	(142)	$ (211)
Net current-period other comprehensive income (loss)			(1,585)
Balance	4,004		4,004
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			8,118
Net current-period other comprehensive income (loss)			(1,574)
Balance	6,544		6,544
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			10
Net current-period other comprehensive income (loss)			(24)
Balance	(14)		(14)
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,287)
Net current-period other comprehensive income (loss)			155
Balance	(2,132)		(2,132)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(252)
Total change in hedge fair value recorded in Other Comprehensive Income			(282)
Amounts reclassified from accumulated other comprehensive income			140
Net change related to derivatives			(142)
Net current-period other comprehensive income (loss)			(142)
Balance	$ (394)		$ (394)