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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
3 Months Ended
Mar. 30, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
 
Accumulated other comprehensive income balance as of December 29, 2012 $ 5,019
Other comprehensive income before reclassifications 607
Amounts reclassified from accumulated other comprehensive income (26)
Net current period comprehensive income 581
Accumulated other comprehensive income balance as of March 30, 2013 $ 5,600