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Fair Value Instruments (Schedule Of Assets Measured At Fair Value Using Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Fair Value Measurements [Abstract]    
Beginning balance $ 415 $ 444
Proceeds from sales of available-for-sale marketable securities (415)  
Unrealized loss transferred from other comprehensive loss to earnings   1
Ending balance   $ 445