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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ 130,119	$ (6,087)	$ 131,008	$ (6,128)
Denominator:
Weighted average common shares outstanding - basic (in shares)	42,928	41,645	42,393	41,423
Computation of diluted securities:
Weighted average number of shares outstanding - diluted (in shares)	44,275	41,645	43,333	41,423
Net income (loss) per share:
Basic net income (loss) per common share (in USD per share)	$ 3.03	$ (0.15)	$ 3.09	$ (0.15)
Diluted net income (loss) per common share (in USD per share)	$ 2.94	$ (0.15)	$ 3.02	$ (0.15)
Employee Stock Option
Computation of diluted securities:
Dilutive effect of share based compensation arrangements (in shares)	1,086	0	740	0
Restricted Stock Units (RSUs)
Computation of diluted securities:
Dilutive effect of share based compensation arrangements (in shares)	261	0	200	0