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Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) (Accumulated Net Unrealized Investment Gain (Loss) [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 28, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
 
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income balance as of December 29, 2012 $ 5,019
Other comprehensive loss before reclassifications (512)
Amounts reclassified from accumulated other comprehensive income (963)
Net current period other comprehensive loss (1,475)
Accumulated other comprehensive income balance as of September 28, 2013 $ 3,544