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DEBT - Convertible Senior Notes Narrative (Details)	1 Months Ended
	Feb. 29, 2020 USD ($) tradingDay $ / shares	Mar. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Redemption percentage	100.00%
Convertible senior notes, net		$ 588,418,000		$ 518,203,000
Impact of ASU adoption		478,925,000		542,172,000	$ 566,611,000	$ 539,010,000
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Convertible senior notes, net			$ 587,700,000
Retained Earnings
Debt Instrument [Line Items]
Impact of ASU adoption		$ 340,223,000		339,879,000	$ 383,142,000	$ 410,919,000
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Impact of ASU adoption				(52,205,000)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Convertible senior notes, net			$ 69,500,000
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Debt Instrument [Line Items]
Impact of ASU adoption				9,399,000
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Impact of ASU adoption				$ 9,400,000
On or after March 1, 2023
Debt Instrument [Line Items]
Redemption percentage	100.00%
Convertible debt
Debt Instrument [Line Items]
Face amount	$ 600,000,000
Interest rate	0.75%
Initial conversion rate	7.4045
Debt conversion amount	$ 1,000
Initial conversion price (in dollars per share) | $ / shares	$ 135.05
Convertible debt | After the calendar quarter ending on June 30, 2020
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130.00%
Threshold trading days | tradingDay	20
Threshold consecutive trading days | tradingDay	30
Convertible debt | Measurement period
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	98.00%
Threshold consecutive trading days | tradingDay	5
Threshold consecutive business days | tradingDay	5
Convertible debt | On or after March 1, 2023
Debt Instrument [Line Items]
Threshold percentage of stock price trigger	130.00%
Threshold trading days | tradingDay	20
Threshold consecutive trading days | tradingDay	30

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