Warranty Costs (Schedule Of Activity Reflects In Aggregate Accrued Warranty Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Warranty Costs [Abstract]
Accrued Warranty Costs - Beginning of Period	$ 1,701	$ 1,931	$ 1,712	$ 1,892
Warranty costs paid	(163)	(42)	(263)	(138)
Warranty costs accrued	190	(2)	279	133
Accrued Warranty Costs - End of Period	$ 1,728	$ 1,887	$ 1,728	$ 1,887