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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements (Details) - Unsecured Debt - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Jul. 31, 2020 | Mar. 31, 2017
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Convertible Senior Notes Due 2025 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Debt instrument, unamortized discount | $ 68,744 | $ 80,530 |  |
Stated interest rate (as a percent) | 0.75% |  | 0.75% |
Convertible Senior Notes Due 2022 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Debt instrument, unamortized discount | $ 3,806 | $ 9,263 |  |
Stated interest rate (as a percent) | 2.375% |  | 2.375% | 2.375%

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