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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 03, 2017
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Intrinsic value of options exercised   $ 0.3
Intrinsic value of options outstanding   $ 25.0
Common stock to be purchased in exchange for options (in shares)   34,000
Total unrecognized compensation cost   $ 10.3
Weighted-average recognition period for unrecognized compensation cost   3 years
Tender Offer, Exchange Out of the Money Stock Optionsfor Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock to be purchased in exchange for options (in shares) 2,362,470  
Replacement awards of restricted stock units (in shares) 733,559  
Restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of stock vested during period   $ 0.8
Intrinsic value of restricted stock units outstanding   $ 16.5