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LONG-TERM DEBT Summary of long-term debt (Details) - USD ($)
$ in Thousands
Jul. 01, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total $ 117,199 $ 118,756
Long-term debt, less current portion 117,199 116,489
Bank of America, N.A. and Wells Fargo Capital Finance, LLC    
Debt Instrument [Line Items]    
Total 117,199 95,900
Synovus Bank    
Debt Instrument [Line Items]    
Total 0 22,856
Current portion of long-term debt $ 0 $ 2,267