Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 5,589,000
Total change in hedge fair value recorded in Other Comprehensive Income		(267,000)
Amounts reclassified from accumulated other comprehensive income		202,000
Net change related to derivatives		(65,000)	$ (115,000)	$ (137,000)
Net current-period other comprehensive income (loss)		6,913,000
Balance		12,502,000	5,589,000
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	8,118,000
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 (loss)	[1]	6,848,000
Balance	[1]	14,966,000	8,118,000
Net of income tax benefit (expense)		34,000
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		10,000
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 (loss)		(22,000)
Balance		(12,000)	10,000
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[2]	(2,287,000)
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 (loss)	[2]	152,000
Balance	[2]	(2,135,000)	(2,287,000)
Net of income tax benefit (expense)		(55,000)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[3]	(252,000)
Total change in hedge fair value recorded in Other Comprehensive Income	[3]	(267,000)
Amounts reclassified from accumulated other comprehensive income	[3]	202,000
Net change related to derivatives	[3]	(65,000)
Net current-period other comprehensive income (loss)	[3]	(65,000)
Balance	[3]	(317,000)	$ (252,000)
Net of income tax benefit (expense)		$ 23,000

[1] Net of income tax benefit of $34,000.

[2] Net of income tax expense of $55,000.

[3] Net of income tax benefit of $23,000