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FINANCING ARRANGEMENTS - Schedule of Convertible Senior Notes (Details) - Senior Notes - USD ($)	Dec. 31, 2021	Apr. 30, 2021	Dec. 31, 2020	Apr. 30, 2016
1.125% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Principal amount	$ 230,000,000	$ 230,000,000
Less: debt discount	(6,597,000)
Net carrying amount of liability component	$ 223,403,000
3.25% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Principal amount			$ 250,000,000	$ 250,000,000
Less: debt discount - transaction costs			(1,459,000)
Less: debt discount - equity			(19,051,000)
Net carrying amount of liability component			229,490,000
Net carrying amount of equity component			$ 67,014,000

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