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Long-Term Debt (Subsequent Event) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Debt Instrument [Line Items]          
Gains (losses) on extinguishment of debt   $ 0 $ (1,280,000) $ (559,000) $ (27,778,000)
Subsequent Event [Member] | Other debt including capital leases [Member] | Equipment note [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 12,500,000.0        
Debt interest rate (percent) 8.25%        
Long-term debt, outstanding principal amount $ 12,300,000        
Gains (losses) on extinguishment of debt $ (200,000)        
Subsequent Event [Member] | Other debt including capital leases [Member] | Equipment note [Member] | Redemption within Year 1 [Member]          
Debt Instrument [Line Items]          
Debt prepayment fee (percent) 3.00%        
Subsequent Event [Member] | Other debt including capital leases [Member] | Equipment note [Member] | Redemption during Year 2 [Member]          
Debt Instrument [Line Items]          
Debt prepayment fee (percent) 2.00%        
Subsequent Event [Member] | Other debt including capital leases [Member] | Equipment note [Member] | Redemption subsequent to Year 2 [Member]          
Debt Instrument [Line Items]          
Debt prepayment fee (percent) 1.00%