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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
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 31,698	$ 68,936
Notes due 2023 interest and financing costs, net	44	44
Adjusted net income	$ 31,742	$ 68,980
Denominator:
Weighted average common shares outstanding (in shares)	131,303	123,531
Employee stock-based awards (in shares)	5,735	8,609
Weighted average common shares outstanding for diluted calculation (in shares)	146,442	138,104
Net income per share, basic (in USD per share)	$ 0.24	$ 0.56
Net income per share, diluted (in USD per share)	$ 0.22	$ 0.50
Convertible Senior Notes Due 2024
Denominator:
Warrants (issued in conjunction with Notes) (in shares)	2,506	2,128
Convertible Senior Notes Due 2025
Denominator:
Warrants (issued in conjunction with Notes) (in shares)	1,301	0
Convertible Notes | Convertible Senior Notes Due 2023
Denominator:
Notes due (in shares)	900	900
Convertible Notes | Convertible Senior Notes Due 2024
Denominator:
Notes due (in shares)	2,984	2,936
Convertible Notes | Convertible Senior Notes Due 2025
Denominator:
Notes due (in shares)	1,713	0

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

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- References

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