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LONG-TERM DEBT - Convertible Debt Narrative (Details) - Convertible debt | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) shares numberOfDay $ / shares | Dec. 31, 2020 USD ($) | Jul. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Principal amount, long-term debt issued | $ | $ 93,100,000 |  | $ 230,000,000
Interest rate on convertible debt | 5.00% |  | 5.00%
Repurchased face amount | $ |  | $ 136,900,000 |
Initial conversion rate, convertible debt | 46.0829 |  |
Initial conversion price, convertible debt (in dollars per share) | $ / shares | $ 21.70 |  |
Threshold trading days | 20 |  |
Threshold consecutive trading days | 30 |  |
Threshold percentage of stock price trigger | 130.00% |  |
Number of business days after the specified trading price criteria met that notes may be converted | 5 |  |
Consecutive trading days, trading price criteria | 5 days |  |
Convertible debt, threshold percentage, product of common stock price and conversion price | 98.00% |  |
Number of shares into which debt is convertible | shares | 4,291,705 |  |
Debt instrument, convertible, threshold percentage of stock price trigger for redemption | 130.00% |  |
Debt instrument, convertible, threshold trading days for redemption | 20 |  |
Threshold consecutive trading days for redemption | 30 days |  |
Redemption price, percentage (equal to) | 100.00% |  |
Remaining amortization period of convertible debt | 22 months |  |

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