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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Consolidated Statements of Comprehensive Income [Abstract]      
Unrealized holding (losses) gains arising during period, tax $ 0 $ 923 $ 288
Reclassification adjustment for gains included in net income, tax $ 293 $ 601 $ 93