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LONG-TERM DEBT Summary of long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Debt Instrument [Line Items]    
Total $ 118,756 $ 137,629
Long-term debt, less current portion 116,489 135,362
Bank of America, N.A. and Wells Fargo Capital Finance, LLC    
Debt Instrument [Line Items]    
Total 95,900 112,507
Synovus Bank    
Debt Instrument [Line Items]    
Total 22,856 25,122
Long-term debt, current maturities $ 2,267 $ 2,267