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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Consolidated Statements of Comprehensive Income      
Unrealized holding gains arising during period, tax $ 923 $ 288 $ 47
Reclassification adjustment for gains included in net income, tax $ 601 $ 93 $ 0