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SHARE-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 01, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Exercised (in shares) (9,000)  
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Beginning number of shares, outstanding (in shares) 765,411  
Exercised (in shares) (9,000)  
Number of shares, outstanding (in shares) 756,411 765,411
Ending number of shares, options exercisable 536,011 498,611
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward]    
Beginning balance of options outstanding (in dollars per share) $ 10.27  
Exercised (in dollars per share) 8.36  
Ending balance of options outstanding (in dollars per share) 10.29 $ 10.27
Options exercisable at end of period $ 8.53 $ 8.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward]    
Options outstanding, weighted average remaining contractual term 7 years 7 days 7 years 3 months 7 days
Optons exercisable, weighted average remaining contractual term 6 years 5 months 23 days 6 years 9 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward]    
Beginning balance, intrinsic value $ 4,521  
Ending value, intrinsic value 6,579 $ 4,521
Options exercisable, aggregate intrinsic value $ 5,605 $ 3,640
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Nonvested, number of shares 220,400 266,800
Nonvested options, weighted average grant date fair value $ 3.12 $ 3.09