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EQUITY-BASED COMPENSATION - Schedule of compensation expense recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2017
Sep. 28, 2016
Sep. 27, 2017
Sep. 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 1,289 $ 1,577 $ 3,823 $ 3,817
Total income tax benefit recognized related to equity-based compensation 47 53 142 117
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense 816 1,085 2,643 3,168
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense 345 492 1,029 649
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation expense $ 128 $ 0 $ 151 $ 0