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Fair Value Measurements (Fair Value Measurements - Carrying Amount and Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Finance lease obligations [1] $ 19,955 $ 19,483
Operating Lease, Liability 24,304 25,295
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents 383 769
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term debt and finance leases, including current portion 59,098 68,868
Finance lease obligations 19,955 19,483
Operating Lease, Liability 24,304 25,295
Interest rate swaps 2,419 1,653
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents 383 769
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term debt and finance leases, including current portion 59,610 72,115
Finance lease obligations 20,204 20,361
Operating Lease, Liability 24,304 25,295
Interest rate swaps $ 2,419 $ 1,653
[1] Includes leases classified as failed sale-leaseback transactions.