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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 24, 2012
Mar. 26, 2011
Income tax effect on unrealized hedging gains (losses) $ 1,636 $ (578)
Income tax effect on reclassification of realized losses to net income (199) 301
Unrealized Gains (Losses) on Hedges
   
Income tax effect on unrealized hedging gains (losses) 1,636 (578)
Income tax effect on reclassification of realized losses to net income $ (199) $ 301