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NET INCOME PER SHARE - Narrative (Details) - $ / shares	3 Months Ended
NET INCOME PER SHARE - Narrative (Details) - $ / shares	Mar. 31, 2021	Mar. 31, 2020	Mar. 01, 2021	Mar. 09, 2020	Jun. 05, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	3,445,000	0
Convertible Senior Notes Due 2024 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)					$ 20.50
Convertible Senior Notes Due 2025 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)				$ 81.54
Convertible Senior Notes Due 2026 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)			$ 307.47
Convertible Senior Notes Due 2028 \| Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)			$ 284.87