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STOCK BASED COMPENSATION - Summary of Stock Option Plan Activity (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Shares  
Outstanding, Beginning balance (in shares) | shares 3,239,995
Granted (in shares) | shares 985,885
Exercised (in shares) | shares (754,880)
Canceled/Forfeited (in shares) | shares (116,220)
Outstanding, Ending balance (in shares) | shares 3,354,780
Options exercisable (in shares) | shares 1,410,017
Weighted Average Exercise Price Per Share  
Outstanding, Beginning balance (usd per share) | $ / shares $ 18.87
Granted (usd per share) | $ / shares 18.08
Exercised (usd per share) | $ / shares 17.23
Canceled/Forfeited (usd per share) | $ / shares 19.78
Outstanding, Ending balance (usd per share) | $ / shares 18.98
Options exercisable (usd per share) | $ / shares $ 19.11