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STOCK-BASED COMPENSATION - Summary of Restricted Stock Units activity (Details) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at the beginning of period | shares 608
Granted | shares 227
Vested | shares (125)
Forfeited | shares (110)
Outstanding at the end of period | shares 600
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares $ 58.15
Weighted Average Grant Date Fair Value, Granted | $ / shares 93.93
Weighted Average Grant Date Fair Value, Vested | $ / shares 58.18
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 65.70
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 70.37