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NET INCOME (LOSS) PER SHARE - Schedule of Computation of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income $ 17,660 $ 130,119 $ 47,110 $ 131,008
Denominator:        
Weighted average common shares outstanding - basic (in shares) 44,476 42,928 44,151 42,393
Computation of diluted securities:        
Dilutive effect of conversion premium on the 2022 Notes (in shares) 0 0 51 0
Weighted average number of shares outstanding - diluted (in shares) 45,463 44,275 45,674 43,333
Net income per share:        
Basic net income per common share (in USD per share) $ 0.40 $ 3.03 $ 1.07 $ 3.09
Diluted net income per common share (in USD per share) $ 0.39 $ 2.94 $ 1.03 $ 3.02
Employee Stock Option        
Computation of diluted securities:        
Dilutive effect of share based compensation arrangements (in shares) 827 1,086 1,132 740
Restricted Stock Units (RSUs)        
Computation of diluted securities:        
Dilutive effect of share based compensation arrangements (in shares) 160 261 337 200
ESPP        
Computation of diluted securities:        
Dilutive effect of share based compensation arrangements (in shares) 0 0 3 0