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FINANCING ARRANGEMENTS - Schedule of Notes (Details) - Senior Notes - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Apr. 30, 2016
3.25% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Principal amount	$ 250,000,000	$ 250,000,000	$ 250,000,000.0
Less: debt discount - transaction costs	(1,239,000)	(1,459,000)
Less: debt discount - equity	0	(19,051,000)	$ (4,800,000)
Net carrying amount of liability component	248,761,000	229,490,000
Net carrying amount of equity component	0	$ 67,014,000
1.125% Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Principal amount	200,000,000.0
Less: debt discount - equity	(6,765,000)
Net carrying amount of liability component	$ 193,235,000

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