Other Comprehensive Income (Loss) (Schedule Of Items Reclassified Out Of AOCI And The Corresponding Location And Impact On The Condensed Consolidated Statements Of Operations) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension plan adjustments	$ 456	$ 427	$ 1,368	$ 1,280
Income tax benefit	(187)	(179)	(562)	(461)
Net of tax	$ 269	$ 248	$ 806	$ 819