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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 25, 2013
Dec. 26, 2012
Dec. 28, 2011
Valuation Allowance [Line Items]      
Tax benefit recognized $ (420,000) $ (661,000) $ (89,102,000)
Valuation allowance, amount credited to paid-in capital 2,000,000    
Effective income tax reconciliation change in and release of valuation allowance (1.00%) (2.00%) (315.00%)
Deferred tax benefit 9,100,000 11,423,000 3,223,000
Out-of-period discrete tax adjustment   1,700,000  
Tax credit carryforward 29,490,000 35,105,000  
Alternative minimum tax credit carryforwards 10,344,000 12,948,000  
South Carolina net operating loss carryforwards 75.00%    
Unrecognized tax benefits 0 0  
General Business Tax Credit Carryforward [Member]
      
Valuation Allowance [Line Items]      
Deferred tax benefit 300,000    
Tax credit carryforward 32,200,000    
Tax credit carryforwards unrecognized 5,300,000    
Alternative Minimum Tax Credit Carryforward [Member]
      
Valuation Allowance [Line Items]      
Alternative minimum tax credit carryforwards 10,300,000    
AMT NOL Carryforwards [Member]
      
Valuation Allowance [Line Items]      
NOL carryforwards 63,200,000    
State and Local Jurisdiction [Member]
      
Valuation Allowance [Line Items]      
Tax benefit recognized (200,000)    
State job tax credits 800,000    
Out-of-period discrete tax adjustment   $ 1,600,000