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Stock Compensation (Details) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 30, 2011
Dec. 31, 2010
Dec. 31, 2012
Common Class A [Member]
Dec. 30, 2011
Common Class A [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Common Class A [Member]
Dec. 30, 2011
Restricted Stock Units (RSUs) [Member]
Common Class A [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Common Class A [Member]
Dec. 30, 2011
Restricted Stock [Member]
Common Class A [Member]
Sep. 24, 2009
Restricted Stock [Member]
Common Class A [Member]
Dec. 31, 2012
Restricted Stock [Member]
Selling, General and Administrative Expenses [Member]
Dec. 30, 2011
Restricted Stock [Member]
Selling, General and Administrative Expenses [Member]
Dec. 31, 2010
Restricted Stock [Member]
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common Stock, Capital Shares Reserved for Future Issuance                     21,737      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number               9,825            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           400 700 1,200 800 750        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               (4,300)            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period               (375)            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number               6,350            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value               $ 636            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value               $ 784 $ 784 $ 577        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value               $ 643            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value               $ 654            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value               $ 658            
Share-based Compensation $ 3,036,000 $ 3,050,000 $ 2,334,000                 $ 3,000,000 $ 3,000,000 $ 2,300,000
Fair Value Inputs, Discount Rate       10.25% 11.00%                  
Fair Value Inputs, Discount for Lack of Marketability       25.00%                    
Minority interest discount 20.00%                          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized               $ 3,000,000            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition               1 year