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FINANCING ARRANGEMENTS - 3.25% Convertible Senior Notes due 2022 (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Apr. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ (5,090,000) | $ 0 | $ (5,090,000) | $ 0 |  |
3.25% Convertible Senior Notes due 2022 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 3.25%
Principal amount |  |  |  |  |  |  | $ 250,000,000.0
Aggregate purchase price |  |  |  |  |  | $ 255,000,000.0 |
Repurchased debt outstanding principal amount |  |  |  |  |  | $ 250,000,000.0 |
Accrued and unpaid interest | $ 1,000,000.0 |  |  |  |  |  |
Debt repurchase prepayment penalty | $ 4,000,000.0 |  |  |  |  |  |
Loss on extinguishment of debt |  | $ (5,100,000) |  |  |  |  |

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