Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 6,115
Total change in hedge fair value recorded in Other Comprehensive Income	(81)
Amounts reclassified from accumulated other comprehensive income	12
Net change related to derivatives	(69)
Net current-period other comprehensive income (loss)	1,510
Balance	7,625
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	8,687
Net current-period other comprehensive income (loss)	1,526
Balance	10,213
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)	2
Balance	5
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)	51
Balance	(2,387)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(137)
Total change in hedge fair value recorded in Other Comprehensive Income	(81)
Amounts reclassified from accumulated other comprehensive income	12
Net change related to derivatives	(69)
Net current-period other comprehensive income (loss)	(69)
Balance	$ (206)