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Long-Term Debt and Credit Arrangements (Interest payments and debt maturities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Debt Instrument [Line Items]      
Interest paid $ 5,293 $ 6,303 $ 6,290
Finance Lease, Interest Payment on Liability 1,702 [1] 1,378 [1] $ 791
Maturities of Long-term Debt [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 6,114    
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,006    
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,603    
Long-term Debt, Maturities, Repayments of Principal in Year Four 6,903    
Long-term Debt, Maturities, Repayments of Principal in Year Five 30,897    
Long-term Debt, Maturities, Repayments of Principal after Year Five 29,564    
Long-term Debt 80,087    
Deferred financing costs, net (1,930) (571)  
Total long-term debt 78,157 $ 88,351  
Long-term Debt [Member]      
Maturities of Long-term Debt [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 3,346    
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,520    
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,259    
Long-term Debt, Maturities, Repayments of Principal in Year Four 6,578    
Long-term Debt, Maturities, Repayments of Principal in Year Five 30,540    
Long-term Debt, Maturities, Repayments of Principal after Year Five 19,906    
Long-term Debt 63,149    
Deferred financing costs, net (1,930)    
Total long-term debt 61,219    
Finance Lease Obligations [Member]      
Maturities of Long-term Debt [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2,768    
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,486    
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,344    
Long-term Debt, Maturities, Repayments of Principal in Year Four 325    
Long-term Debt, Maturities, Repayments of Principal in Year Five 357    
Long-term Debt, Maturities, Repayments of Principal after Year Five 9,658    
Long-term Debt 16,938    
Deferred financing costs, net 0    
Total long-term debt $ 16,938    
[1] (1) Includes leases classified as failed sale-leaseback transactions.