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Supplemental Financial Information (Schedule Of Warranty Liability Activity, I) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Supplemental Financial Information [Abstract]    
Beginning balance $ 235 $ 189
Estimated cost of warranty claims charged to cost of sales 31 54
Cost of actual warranty claims (14) (42)
Ending balance $ 252 $ 201