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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Jan. 01, 2011
Jan. 02, 2010
Consolidated Statements of Changes in Stockholders' Equity      
Unrealized gains on available-for-sale securities, tax $ (1) $ (143) $ (522)
Unrealized gains on cash flow hedges, tax $ (635) $ (238) $ (389)