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FINANCIAL INSTRUMENTS - Fair Value of Liabilities Measured on a Recurring Basis (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Jul. 31, 2020 | Mar. 31, 2017
Reported Value Measurement |  |  |
Financial Assets: |  |  |
Notes receivable | $ 4,164 |  |
Financial Liabilities: |  |  |
Acquisition-related contingent consideration | 16,199 |  |
Reported Value Measurement | Convertible Senior Notes Due 2022 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 155,751 |  |
Reported Value Measurement | Convertible Senior Notes Due 2025 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 326,146 |  |
Estimate of Fair Value Measurement | Level 1 |  |  |
Financial Assets: |  |  |
Notes receivable | 0 |  |
Financial Liabilities: |  |  |
Acquisition-related contingent consideration | 0 |  |
Estimate of Fair Value Measurement | Level 1 | Convertible Senior Notes Due 2022 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 0 |  |
Estimate of Fair Value Measurement | Level 1 | Convertible Senior Notes Due 2025 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 0 |  |
Estimate of Fair Value Measurement | Level 2 |  |  |
Financial Assets: |  |  |
Notes receivable | 0 |  |
Financial Liabilities: |  |  |
Acquisition-related contingent consideration | 0 |  |
Estimate of Fair Value Measurement | Level 2 | Convertible Senior Notes Due 2022 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 166,000 |  |
Estimate of Fair Value Measurement | Level 2 | Convertible Senior Notes Due 2025 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 437,216 |  |
Estimate of Fair Value Measurement | Level 3 |  |  |
Financial Assets: |  |  |
Notes receivable | 4,164 |  |
Financial Liabilities: |  |  |
Acquisition-related contingent consideration | 16,199 |  |
Estimate of Fair Value Measurement | Level 3 | Convertible Senior Notes Due 2022 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | 0 |  |
Estimate of Fair Value Measurement | Level 3 | Convertible Senior Notes Due 2025 |  |  |
Financial Liabilities: |  |  |
Convertible senior notes | $ 0 |  |
Closing sale price (in dollars per share) | $ 56.00 |  |
Convertible Senior Notes Due 2022 |  |  |
Financial Liabilities: |  |  |
Closing sale price (in dollars per share) |  |  | $ 48.65
Initial conversion price of notes into common stock (in dollars per share) |  |  | $ 66.89
Convertible Senior Notes Due 2022 | Maximum |  |  |
Financial Liabilities: |  |  |
Debt instrument, convertible, conversion premium (in shares) | 2.4 |  |
Convertible Senior Notes Due 2022 | Unsecured Debt |  |  |
Financial Liabilities: |  |  |
Stated interest rate (as a percent) | 2.375% | 2.375% | 2.375%
Convertible Senior Notes Due 2025 |  |  |
Financial Liabilities: |  |  |
Closing sale price (in dollars per share) |  | $ 54.17 |
Initial conversion price of notes into common stock (in dollars per share) |  | $ 71.78 | $ 71.78
Convertible Senior Notes Due 2025 | Maximum |  |  |
Financial Liabilities: |  |  |
Debt instrument, convertible, conversion premium (in shares) | 5.6 |  |
Convertible Senior Notes Due 2025 | Unsecured Debt |  |  |
Financial Liabilities: |  |  |
Stated interest rate (as a percent) | 0.75% | 0.75% |

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