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CONVERTIBLE NOTES - Schedule of Convertible Notes (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Feb. 29, 2020 | Mar. 31, 2019 | Jan. 31, 2018
--- | --- | --- | --- | --- | ---
Convertible Notes |  |  |  |  |
Long-term debt |  |  |  |  |
Coupon interest rate |  |  |  |  | 1.00%
Notes |  |  |  |  |
Long-term debt |  |  |  |  |
Coupon interest rate |  |  |  | 0.375% |
2028 Notes |  |  |  |  |
Long-term debt |  |  |  |  |
Coupon interest rate | 0.375% | 0.375% | 0.375% |  |
Principal Amount | $ 1,150,000 | $ 1,150,000 |  |  |
Unamortized Debt Discount and Issuance Costs | (19,596) | (21,878) |  |  |
Net Carrying Amount | 1,130,404 | 1,128,122 |  |  |
2028 Notes | Level 2 | Fair Value |  |  |  |  |
Long-term debt |  |  |  |  |
Convertible notes, fair value | $ 1,222,968 | $ 1,526,625 |  |  |
2027 Notes |  |  |  |  |
Long-term debt |  |  |  |  |
Coupon interest rate | 0.375% | 0.375% |  |  |
Principal Amount | $ 747,500 | $ 747,500 |  |  |
Unamortized Debt Discount and Issuance Costs | (12,257) | (13,937) |  |  |
Net Carrying Amount | 735,243 | 733,563 |  |  |
2027 Notes | Level 2 | Fair Value |  |  |  |  |
Long-term debt |  |  |  |  |
Convertible notes, fair value | $ 834,285 | $ 992,306 |  |  |
2025 notes |  |  |  |  |
Long-term debt |  |  |  |  |
Coupon interest rate | 1.00% | 1.00% |  |  |
Principal Amount | $ 315,005 | $ 315,049 |  |  |
Unamortized Debt Discount and Issuance Costs | (1,901) | (2,333) |  |  |
Net Carrying Amount | 313,104 | 312,716 |  |  |
2025 notes | Level 2 | Fair Value |  |  |  |  |
Long-term debt |  |  |  |  |
Convertible notes, fair value | $ 455,204 | $ 601,744 |  |  |

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