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NET INCOME PER SHARE - Schedule of Computation of Basic and Diluted Net Income Per Share (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	$ 21,809	$ 39,362	$ 92,858	$ 61,004
Notes due 2023 interest and financing costs, net	44	44	133	133
Adjusted net income	$ 21,853	$ 39,406	$ 92,991	$ 61,137
Denominator:
Weighted average common shares outstanding (in shares)	134,721	126,109	133,719	125,084
Employee stock-based awards (in shares)	4,379	6,330	4,919	7,123
Weighted average common shares outstanding for diluted calculation (in shares)	141,220	141,820	143,091	140,207
Net income per share, basic (in USD per share)	$ 0.16	$ 0.31	$ 0.69	$ 0.49
Net income per share, diluted (in USD per share)	$ 0.15	$ 0.28	$ 0.65	$ 0.44
Convertible Senior Notes Due 2024
Denominator:
Warrants (in shares)	44	4,013	856	3,251
Convertible Senior Notes Due 2025
Denominator:
Warrants (in shares)	472	0	707	0
Convertible Notes | Convertible Senior Notes Due 2023
Denominator:
Notes due (in shares)	900	900	900	900
Convertible Notes | Convertible Senior Notes Due 2024
Denominator:
Notes due (in shares)	46	4,468	1,014	3,849
Convertible Notes | Convertible Senior Notes Due 2025
Denominator:
Notes due (in shares)	658	0	976	0

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