Warranty Costs (Schedule Of Activity Reflects In Aggregate Accrued Warranty Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Warranty Costs [Abstract]
Accrued Warranty Costs - Beginning of Period	$ 1,728	$ 1,887	$ 1,712	$ 1,892
Warranty costs paid	(106)	(67)	(369)	(205)
Warranty costs accrued	255	28	534	161
Warranty liability sold	(1,249)		(1,249)
Accrued Warranty Costs - End of Period	$ 628	$ 1,848	$ 628	$ 1,848