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Fair Value Measurements (Fair Value Measurements - Carrying Amount and Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Finance Lease, Liability $ 16,938 $ 19,483
Operating Lease, Liability 22,727 25,295
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents 1,920 769
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term debt and capital leases, including current portion 61,219 68,868
Finance Lease, Liability 16,938 19,483
Interest rate swaps 440 1,653
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents 1,920 769
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term debt and capital leases, including current portion 58,803 72,115
Finance Lease, Liability 18,451 20,361
Interest rate swaps $ 440 $ 1,653