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NET INCOME (LOSS) 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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income (loss)	$ 39,351	$ (47,294)	$ 71,049	$ 21,642
Notes due 2023 interest and financing costs, net	45	0	89	89
Adjusted net income (loss)	$ 39,396	$ (47,294)	$ 71,138	$ 21,731
Denominator:
Weighted average common shares outstanding (in shares)	135,094	125,603	133,209	124,567
Employee stock-based awards (in shares)	4,554	0	5,177	7,449
Weighted average common shares outstanding for diluted calculation (in shares)	141,533	125,603	144,022	138,910
Net income (loss) per share, basic (in USD per share)	$ 0.29	$ (0.38)	$ 0.53	$ 0.17
Net income (loss) per share, diluted (in USD per share)	$ 0.28	$ (0.38)	$ 0.49	$ 0.16
Convertible Senior Notes Due 2024
Denominator:
Warrants (issued in conjunction with Notes) (in shares)	43	0	1,268	2,641
Convertible Senior Notes Due 2025
Denominator:
Warrants (issued in conjunction with Notes) (in shares)	340	0	825	0
Convertible Notes | Convertible Senior Notes Due 2023
Denominator:
Notes due (in shares)	900	0	900	900
Convertible Notes | Convertible Senior Notes Due 2024
Denominator:
Notes due (in shares)	45	0	1,506	3,353
Convertible Notes | Convertible Senior Notes Due 2025
Denominator:
Notes due (in shares)	557	0	1,137	0

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