Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 6,115
Total change in hedge fair value recorded in Other Comprehensive Income		(253)
Amounts reclassified from accumulated other comprehensive income		42
Net change related to derivatives	$ (20)	(211)
Net current-period other comprehensive income (loss)		(7,403)
Balance	(1,288)	(1,288)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		8,687
Net current-period other comprehensive income (loss)		(7,351)
Balance	1,336	1,336
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)		4
Balance	7	7
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)		155
Balance	(2,283)	(2,283)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(137)
Total change in hedge fair value recorded in Other Comprehensive Income		(253)
Amounts reclassified from accumulated other comprehensive income		42
Net change related to derivatives		(211)
Net current-period other comprehensive income (loss)		(211)
Balance	$ (348)	$ (348)