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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Minimum Weeks In Fiscal Year     P52W  
Maximum Weeks In Fiscal Year     P53W  
Number Of Weeks in Quarter P13W P13W    
Number Of Weeks Year To Date     P39W P39W
Basic:        
Net income $ 27,651 $ 37,172 $ 86,474 $ 101,968
Shares 118,208,000 117,678,000 118,156,000 117,531,000
Per Share $ 0.23 $ 0.32 $ 0.73 $ 0.87
Effect of dilutive securities: [Abstract]        
Add: Option shares in the money and dilutive effect of non-vested stock 690,000 792,000 688,000 844,000
Less: Pro forma treasury shares (418,000) (296,000) (296,000) (326,000)
Diluted:        
Net Income $ 27,651 $ 37,172 $ 86,474 $ 101,968
Shares 118,480,000 118,174,000 118,548,000 118,049,000
Per Share $ 0.23 $ 0.31 $ 0.73 $ 0.86
Stock Options [Member]
        
Antidilutive Securities [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 331,367 207,890 284,787 211,890
Non Vested Stock [Member]
        
Antidilutive Securities [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 55,465 100,615 59,853 111,675