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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. 27, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
 
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income balance as of December 28, 2013 $ 3,939
Other comprehensive income before reclassifications 1,182
Amounts reclassified from accumulated other comprehensive income (26)
Net current period other comprehensive income 1,156
Accumulated other comprehensive income balance as of September 27, 2014 $ 5,095