Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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			115
Net change related to derivatives	$ 55	$ 10	116	$ (205)
Net current-period other comprehensive income (loss)			(4,137)
Balance	8,365		8,365
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			14,966
Net current-period other comprehensive income (loss)			(4,356)
Balance	10,610		10,610
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)			104
Balance	(2,031)		(2,031)
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			115
Net change related to derivatives			116
Net current-period other comprehensive income (loss)			116
Balance	$ (201)		$ (201)