Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 12,502
Total change in hedge fair value recorded in Other Comprehensive Income	1
Amounts reclassified from accumulated other comprehensive income	60
Net change related to derivatives	61	$ (214)
Net current-period other comprehensive income (loss)	(2,545)
Balance	9,957
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	14,966
Net current-period other comprehensive income (loss)	(2,657)
Balance	12,309
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)
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,135)
Net current-period other comprehensive income (loss)	52
Balance	(2,083)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(317)
Total change in hedge fair value recorded in Other Comprehensive Income	1
Amounts reclassified from accumulated other comprehensive income	60
Net change related to derivatives	61
Net current-period other comprehensive income (loss)	61
Balance	$ (256)