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DEBT - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2020 segment | Jul. 31, 2020 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Sep. 30, 2021 USD ($) segment $ / shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($)
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Settlement period - convertible debt conversion request |  |  |  |  |  | 40 days |
Closing sale price (in dollars per share) | $ / shares |  |  |  | $ 56.00 |  | $ 56.00 |
Deferred tax associated with equity component of convertible debt |  |  |  |  |  | $ 20,500,000 |
Amortization period of transaction costs attributable to liability component of convertible debt |  |  |  |  |  | 5 years |
Transaction costs attributable to equity component of convertible debt |  |  |  |  |  | $ 2,700,000 |
Loss on early extinguishment of debt |  |  |  | $ 0 | $ 8,071,000 | $ 0 | $ 8,071,000
Convertible Senior Notes Due 2025 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Percentage of last sale price of common stock |  |  |  | 98.00% |  |  |
Market price of principal amount of notes |  |  |  | 1.086 |  | 1.086 |
Initial conversion rate of common stock per $1,000 of principal amount of Notes |  |  |  |  |  | 0.0139324 |
Initial conversion price of notes into common stock (in dollars per share) | $ / shares |  | $ 71.78 | $ 71.78 |  |  |  |
Convertible debt, premium on common stock |  | 32.50% |  |  |  |  |
Closing sale price (in dollars per share) | $ / shares |  | $ 54.17 |  |  |  |  |
Debt instrument, percentage of principal amount for computation of redemption price |  |  |  | 100.00% |  |  |
Convertible Senior Notes Due 2025 | Debt Conversion Terms Business Day Immediately Preceding February 3, 2020 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Threshold trading days | segment |  |  |  | 20 |  |  |
Threshold consecutive trading days | segment |  |  |  | 30 |  |  |
Threshold percentage stock price trigger |  |  |  | 130.00% |  |  |
Convertible Senior Notes Due 2025 | Debt Redemption Terms on or after August 1, 2023 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Threshold trading days | segment |  |  |  | 20 |  |  |
Threshold consecutive trading days | segment |  |  |  | 30 |  |  |
Threshold percentage stock price trigger |  |  |  | 130.00% |  |  |
Debt instrument, percentage of principal amount for computation of redemption price |  |  |  | 100.00% |  |  |
Convertible Senior Notes Due 2022 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Settlement period - convertible debt conversion request |  |  |  |  |  | 40 days |
Initial conversion rate of common stock per $1,000 of principal amount of Notes |  |  |  |  |  | 0.0149491 |
Initial conversion price of notes into common stock (in dollars per share) | $ / shares |  |  | $ 66.89 |  |  |  |
Convertible debt, premium on common stock |  |  | 37.50% |  |  |  |
Closing sale price (in dollars per share) | $ / shares |  |  | $ 48.65 |  |  |  |
Convertible Senior Notes Due 2022 | Conversion terms prior to close of business on business day immediately proceeding October 1, 2021 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Market price of principal amount of notes |  |  |  | 1.038 |  | 1.038 |
Convertible Senior Notes Due 2022 | Debt Redemption Terms on or after April 1, 2020 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Threshold trading days | segment | 20 |  |  |  |  |  |
Threshold consecutive trading days | segment | 30 |  |  |  |  |  |
Threshold percentage stock price trigger | 130.00% |  |  |  |  |  |
Debt instrument, percentage of principal amount for computation of redemption price | 100.00% |  |  |  |  |  |
Conversion obligation, number of trading days prior to date of notice of redemption | 5 days |  |  |  |  |  |
Unsecured Debt | Convertible Senior Notes Due 2025 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 402,500,000 |  |  |  |  |
Stated interest rate (as a percent) |  | 0.75% |  | 0.75% |  | 0.75% |
Debt issued in private placement |  | $ 390,000,000 |  |  |  | $ 402,500,000 |
Unsecured Debt | Convertible Senior Notes Due 2022 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 160,000,000 |  |  |  |  |
Stated interest rate (as a percent) |  | 2.375% | 2.375% | 2.375% |  | 2.375% |
Debt issued in private placement |  |  | $ 345,000,000 |  |  |  |
Debt instrument, repurchased face amount |  | $ 185,000,000 |  |  |  |  |
Repayments of debt |  | 211,100,000 |  |  |  |  |
Loss on early extinguishment of debt |  | $ 8,100,000 |  |  |  |  |
Convertible Debt | Convertible Senior Notes Due 2025 |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |
Convertible debt, carrying amount of liability component |  |  |  | $ 314,700,000 |  | $ 314,700,000 |
Assumed borrowing rate |  |  |  | 5.78% |  | 5.78% |
Convertible debt, carrying amount of equity component |  |  |  | $ 87,800,000 |  | $ 87,800,000 |
Amortization period of equity component of convertible debt |  |  |  |  |  | 5 years |
Total transaction costs |  |  |  |  |  | $ 12,500,000 |

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