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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Jan. 01, 2012
Reconciliation of Company's total segment operating income, depreciation and amortization, and assets to corresponding consolidated amounts          
Depreciation and Amortization     $ 12,650 $ 13,112  
Operating Income 22,033 26,137 22,552 47,665  
Total Assets 751,570   751,570   772,272
Total segment [Member]
          
Reconciliation of Company's total segment operating income, depreciation and amortization, and assets to corresponding consolidated amounts          
Depreciation and Amortization 6,572 7,265 13,470 15,926  
Operating Income 22,802 27,033 23,290 52,210  
Total Assets 644,061   644,061   658,190
Corporate [Member]
          
Reconciliation of Company's total segment operating income, depreciation and amortization, and assets to corresponding consolidated amounts          
Depreciation and Amortization 698 1,385 1,344 5,306  
Operating Income (769) (896) (738) (4,545)  
Total Assets 107,509   107,509   114,082
Reported Segment [Member]
          
Reconciliation of Company's total segment operating income, depreciation and amortization, and assets to corresponding consolidated amounts          
Depreciation and Amortization 7,270 8,650 14,814 21,232  
Operating Income 22,033 26,137 22,552 47,665  
Total Assets $ 751,570   $ 751,570   $ 772,272