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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 29, 2017
Dec. 30, 2016
ACCRUED LIABILITIES    
Wages and employee benefits $ 28,424 $ 17,792
Insurance accruals 14,894 14,535
Accrued taxes 642 633
Accrued professional fees and other 6,222 6,768
Total accrued liabilities $ 50,182 $ 39,728