Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 20,991,000
Total change in hedge fair value recorded in Other Comprehensive Income	(151,000)
Amounts reclassified from accumulated other comprehensive income	14,000
Net change related to derivatives	(137,000)
Net current-period other comprehensive income	(14,876,000)
Balance	6,115,000
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	23,575,000	[1]
Total change in hedge fair value recorded in Other Comprehensive Income		[1]
Amounts reclassified from accumulated other comprehensive income		[1]
Net change related to derivatives		[1]
Net current-period other comprehensive income	(14,888,000)	[1]
Balance	8,687,000	[1]
Net of income tax expense	389,000
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	8,000
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	(5,000)
Balance	3,000
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,592,000)	[2]
Total change in hedge fair value recorded in Other Comprehensive Income		[2]
Amounts reclassified from accumulated other comprehensive income		[2]
Net change related to derivatives		[2]
Net current-period other comprehensive income	154,000	[2]
Balance	(2,438,000)	[2]
Net of income tax expense	54,000
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		[3]
Total change in hedge fair value recorded in Other Comprehensive Income	(151,000)	[3]
Amounts reclassified from accumulated other comprehensive income	14,000	[3]
Net change related to derivatives	(137,000)	[3]
Net current-period other comprehensive income	(137,000)	[3]
Balance	(137,000)	[3]
Net of income tax expense	$ 48,000

[1] Net of income tax expense of $389,000.

[2] Net of income tax expense of $54,000.

[3] Net of income tax benefit of $48,000