Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 6,115
Total change in hedge fair value recorded in Other Comprehensive Income		(215)
Amounts reclassified from accumulated other comprehensive income		23
Net change related to derivatives	$ (122)	(191)
Net current-period other comprehensive income (loss)		(836)
Balance	5,279	5,279
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		8,687
Net current-period other comprehensive income (loss)		(753)
Balance	7,934	7,934
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		3
Net current-period other comprehensive income (loss)		5
Balance	8	8
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(2,438)
Total change in hedge fair value recorded in Other Comprehensive Income
Amounts reclassified from accumulated other comprehensive income
Net change related to derivatives
Net current-period other comprehensive income (loss)		103
Balance	(2,335)	(2,335)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(137)
Total change in hedge fair value recorded in Other Comprehensive Income		(215)
Amounts reclassified from accumulated other comprehensive income		23
Net change related to derivatives		(191)
Net current-period other comprehensive income (loss)		(191)
Balance	$ (328)	$ (328)