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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 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     P26W P26W
Basic:        
Net income $ 26,418 $ 36,225 $ 58,823 $ 64,796
Shares 118,196,000 117,613,000 118,056,000 117,458,000
Per Share $ 0.22 $ 0.31 $ 0.50 $ 0.55
Effect of dilutive securities: [Abstract]        
Add: Option shares in the money and dilutive effect of non-vested stock 690,000 867,000 688,000 870,000
Less: Pro forma treasury shares (298,000) (339,000) (304,000) (343,000)
Diluted:        
Net Income $ 26,418 $ 36,225 $ 58,823 $ 64,796
Shares 118,588,000 118,141,000 118,440,000 117,985,000
Per Share $ 0.22 $ 0.31 $ 0.50 $ 0.55
Stock Options [Member]
        
Antidilutive Securities [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 331,367 211,890 261,498 211,890
Non Vested Stock [Member]
        
Antidilutive Securities [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 58,942 112,296 61,735 117,746