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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - Stock options
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Stock Option Shares outstanding at beginning of period (in shares) | shares 2,337,119
Stock Option Shares granted (in shares) | shares 428,298
Stock Option Shares exercised (in shares) | shares (428,971)
Stock Option Shares forfeited (in shares) | shares (141,667)
Stock Option Shares outstanding at end of period (in shares) | shares 2,194,779
Stock Option Shares exercisable at end of period (in shares) | shares 1,016,825
Weighted-Average Exercise Price  
Stock Option Shares outstanding at beginning of period (in dollars per share) | $ / shares $ 29.49
Stock Option Shares granted (in dollars per share) | $ / shares 50.14
Stock Option Shares exercised (in dollars per share) | $ / shares 18.21
Stock Option Shares forfeited (in dollars per share) | $ / shares 40.62
Stock Option Shares outstanding at end of period (in dollars per share) | $ / shares 35.01
Stock Option Shares exercisable at end of period (in dollars per share) | $ / shares $ 23.28
Weighted Average Remaining Contractual Term  
Stock Option Shares outstanding at end of period 6 years 8 months 12 days
Stock Option Shares exercisable at end of period 4 years 6 months
Aggregate Intrinsic Value  
Stock Option Shares outstanding at end of period (in dollars) | $ $ 57,527,731
Stock Option Shares exercisable at end of period (in dollars) | $ $ 38,580,169