Accumulated Other Comprehensive Income (Schedule Of Changes In Accumulated Other Comprehensive Income By Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, Beginning balance	$ 3,813	$ 5,322
Other comprehensive income before reclassifications	(664)	990
Amounts reclassified from accumulated other comprehensive income (loss)	(47)	(93)
Net other comprehensive (loss) income	(711)	897
Accumulated other comprehensive income, Ending balance	3,102	6,219
Change In Retiree Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, Beginning balance	4,942	6,453
Amounts reclassified from accumulated other comprehensive income (loss)	(179)	(397)
Net other comprehensive (loss) income	(179)	(397)
Accumulated other comprehensive income, Ending balance	4,763	6,056
Hedging Activities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, Beginning balance	(1,129)	(1,131)
Other comprehensive income before reclassifications	(664)	990
Amounts reclassified from accumulated other comprehensive income (loss)	132	304
Net other comprehensive (loss) income	(532)	1,294
Accumulated other comprehensive income, Ending balance	$ (1,661)	$ 163