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FINANCING ARRANGEMENTS - 1.125% Convertible Senior Notes due 2026 (Details)	1 Months Ended
	Apr. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($) $ / shares	Apr. 30, 2016	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Restricted cash - non-current		$ 169,785,000		$ 0	$ 206,000	$ 236,000
Share price (in usd per share) | $ / shares		$ 50.55
1.125% Convertible Senior Notes due 2026 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		1.125%
Principal amount		$ 200,000,000.0
Net proceeds from issuance of debt		193,000,000.0
Proceeds from debt used for capped call transactions payment		23,800,000
Restricted cash - non-current		$ 169,800,000
Debt conversion ratio			0.0146800
Conversion price (in usd per share) | $ / shares		$ 68.12
Debt related commitment fees and issuance costs		$ 6,800,000
Effective interest rate		1.84%
Fair value of debt		$ 205,400,000
Debt conversion price, premium on stock price		100.00%
1.125% Convertible Senior Notes due 2026 | Senior Notes | Subsequent Event | Maximum
Debt Instrument [Line Items]
Conversion price (in usd per share) | $ / shares	$ 104.80
2026 Notes, Additional | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Principal amount	$ 30,000,000.0
Net proceeds from issuance of debt	29,100,000
Proceeds from debt used for capped call transactions payment	$ 3,600,000

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