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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Valuation Allowance [Line Items]      
Release Of Valuation Allowance $ 661,000 $ 89,102,000 $ 0
Unrecognized Tax Benefits 0 0  
Effective Income Tax Reconciliation Change In And Release Of Valuation Allowance (2.00%) (315.00%) (24.00%)
Tax benefit recognized (700,000) (89,100,000)  
Valuation Allowance, amount credited to paid-in capital 2,000,000    
(Reductions) of the statutory provision related to the reversal or change of valuation allowances 0.00% 0.00% (24.00%)
Out-of-period discrete tax adjustment 1,700,000    
Tax credit carryforward 35,105,000 35,769,000  
Alternative minimum tax credit carryforwards 12,948,000 12,409,000  
South Carolina net operating loss carryforwards 73.00%    
State Credits Related To Prior Year Activity [Member]
      
Valuation Allowance [Line Items]      
Out-of-period discrete tax adjustment (1,600,000)    
General Business Tax Credit Carryforward [Member]
      
Valuation Allowance [Line Items]      
Tax credit carryforward 37,200,000    
Net operating loss carryforwards unrecognized 3,700,000    
Alternative Minimum Tax Credit Carryforward [Member]
      
Valuation Allowance [Line Items]      
Alternative minimum tax credit carryforwards 12,900,000    
Regular NOL Carryforwards [Member]
      
Valuation Allowance [Line Items]      
NOL carryforwards 500,000    
AMT NOL Carryforwards [Member]
      
Valuation Allowance [Line Items]      
NOL carryforwards 117,000,000    
Regular NOL and AMT NOL Carryforwards [Member]
      
Valuation Allowance [Line Items]      
Net operating loss carryforwards unrecognized 500,000    
Regular NOL Carryforwards [Member]
      
Valuation Allowance [Line Items]      
Tax benefit recognized     1,100,000
(Reductions) of the statutory provision related to the reversal or change of valuation allowances     5.00%
Temporary differences [Member]
      
Valuation Allowance [Line Items]      
Tax benefit recognized     (7,200,000)
(Reductions) of the statutory provision related to the reversal or change of valuation allowances     (30.00%)
Other Items [Member]
      
Valuation Allowance [Line Items]      
Tax benefit recognized     $ 300,000
(Reductions) of the statutory provision related to the reversal or change of valuation allowances     1.00%