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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
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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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