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Fair Value Measurements (Fair Value Measurements - Carrying Amount and Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents $ 21 $ 19
Notes receivable 282 282
Interest rate swaps 120 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term debt and capital leases, including current portion 134,705 133,257
Interest rate swaps 1,304 2,229
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and cash equivalents 21 19
Notes receivable 282 282
Interest rate swaps 120 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Long-term debt and capital leases, including current portion 131,083 131,203
Interest rate swaps $ 1,304 $ 2,229