DEBT - Convertible Senior Notes Narrative (Details)			3 Months Ended	9 Months Ended
	Jun. 01, 2022 USD ($)	Jul. 24, 2020 USD ($) day $ / shares Rate shares	Sep. 30, 2020 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	May 31, 2017 USD ($)	May 31, 2017	May 31, 2017 shares	May 31, 2017 $ / shares	May 31, 2017 Rate
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 5,443,000	$ 3,756,000
Amortization of debt discount				1,475,000	22,297,000
Repayments of convertible debt				169,659,000	0
2025 Convertible Notes
Debt Instrument [Line Items]
Initial conversion rate, shares per $1,000 principal amount of notes | shares		2.1683
Initial conversion price per share (in dollars per share) | $ / shares		$ 461.19
Cash repurchase at a price equal to the principal amount of the notes, percentage | Rate		100.00%
Nonconvertible debt borrowing rate at the date of issuance | Rate		5.30%
Debt component of the principal amount		$ 455,600,000
Equity component of the principal amount		119,400,000
Financing costs		15,100,000
Debt issuance costs		12,000,000		8,496,000		$ 8,855,000
Debt issuance costs, equity component		$ 3,100,000
Interest expense				4,400,000	20,300,000
Interest expense recognized associated with the coupon rate				2,100,000	2,200,000
Annual interest rate on convertible senior notes		0.50%
Amortization of debt issuance costs				$ 2,300,000	1,700,000
Amortization of debt discount					16,400,000
2025 Convertible Notes | Conversion option one
Debt Instrument [Line Items]
Threshold trading days | day		20
Threshold consecutive trading days | day		30
Conversion rate, sales price of common stock as a percentage of the conversion price | Rate		130.00%
2025 Convertible Notes | Conversion option two
Debt Instrument [Line Items]
Threshold trading days | day		5
Threshold consecutive trading days | day		5
Conversion rate | Rate		98.00%
2025 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount		$ 575,000,000
Stated interest rate		0.50%		0.50%
Fair value				$ 411,800,000
2025 Notes Under 13-day Purchase Option | Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount		$ 75,000,000
2022 Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount							$ 300,000,000
Initial conversion rate, shares per $1,000 principal amount of notes | shares									4.8163
Initial conversion price per share (in dollars per share) | $ / shares										$ 207.63
Nonconvertible debt borrowing rate at the date of issuance								5.36%
Debt component of the principal amount							238,400,000
Equity component of the principal amount							61,600,000
Financing costs							9,300,000
Debt issuance costs				0		$ 391,000	7,400,000
Debt issuance costs, equity component							$ 1,900,000
Interest expense				800,000	7,100,000
Interest expense recognized associated with the coupon rate				$ 400,000	$ 800,000
Annual interest rate on convertible senior notes				0.625%	0.625%			0.625%			0.625%
Amortization of debt issuance costs				$ 400,000	$ 700,000
Amortization of debt discount					$ 5,600,000
Repayments of convertible debt	$ 169,700,000	234,000,000
Debt repurchase amount		130,300,000
Debt repurchased amount, accrued interest		100,000
Extinguishment of debt		126,000,000
Adjustments to Additional Paid in Capital, Repurchase of Convertible Debt		$ 107,900,000
Loss on extinguishment of debt			$ 7,800,000
2022 Convertible Notes | Convertible Debt
Debt Instrument [Line Items]
Stated interest rate				0.625%