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STOCK-BASED COMPENSATION - Summary of Common Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Jan. 01, 2019
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $   $ 30,321
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number   595,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares   $ 24.32
Award vesting period   4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,327,352  
Shares (in thousands)    
Beginning balance (in shares)   1,000,000
Granted (in shares)   0
Exercised (in shares)   (324,000)
Forfeited (in shares)   (17,000)
Canceled (in shares)   (1,000)
Ending balance (in shares)   658,000
Weighted-Average Exercise Price    
Beginning balance (in usd per share) | $ / shares   $ 22.99
Granted (in usd per share) | $ / shares   0
Exercised (in usd per share) | $ / shares   19.66
Forfeited (in usd per share) | $ / shares   28.10
Canceled (in usd per share) | $ / shares   20.67
Ending balance (in usd per share) | $ / shares   $ 24.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $   $ 27,516
Common stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   5 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   5 years 9 months 14 days