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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The total net proceeds from the notes are as follows (in thousands):
| 2026 Notes |  | 2025 Notes |  | 2023 Notes
Principal amount | $ | 1,000,000 |  |  | $ | 800,000 |  |  | $ | 345,000 |
Less initial purchasers’ discount | (15,000) |  |  | (18,998) |  |  | (8,625) |
Less other issuance costs | (904) |  |  | (822) |  |  | (757) |
Net proceeds | $ | 984,096 |  |  | $ | 780,180 |  |  | $ | 335,618 |
Schedule of Debt | The net carrying amount of the notes is as follows (in thousands):
| June 30, 2021 |  |  |  | December 31, 2020 (1)
| 2026 Notes |  | 2025 Notes |  |  |  | 2026 Notes |  | 2025 Notes |  | 2023 Notes
Principal | $ | 1,000,000 |  |  | $ | 699,992 |  |  |  |  | $ | 1,000,000 |  |  | $ | 800,000 |  |  | $ | 115,576 |
Unamortized debt discount | — |  |  | — |  |  |  |  | (226,732) |  |  | (149,138) |  |  | (9,953) |
Unamortized issuance costs | (13,637) |  |  | (11,015) |  |  |  |  | (11,338) |  |  | (10,248) |  |  | (1,245) |
Net carrying amount | $ | 986,363 |  |  | $ | 688,977 |  |  |  |  | $ | 761,930 |  |  | $ | 640,614 |  |  | $ | 104,378 |
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
Schedule Of Interest Expense Recognized | The following tables set forth the total interest expense recognized related to the notes (in thousands):
| Three Months Ended June 30,
| 2021 |  | 2020 (1)
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Contractual interest expense | $ | — |  |  | $ | 218 |  |  | $ | 12 |  |  | $ | 249 |  |  | $ | 215 |
Amortization of debt discount | — |  |  | — |  |  | — |  |  | 8,842 |  |  | 3,126 |
Amortization of issuance costs | 657 |  |  | 740 |  |  | 74 |  |  | 607 |  |  | 371 |
Total interest expense | $ | 657 |  |  | $ | 958 |  |  | $ | 86 |  |  | $ | 9,698 |  |  | $ | 3,712 |
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
| Six Months Ended June 30,
| 2021 |  | 2020 (1)
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Contractual interest expense | $ | — |  |  | $ | 455 |  |  | $ | 78 |  |  | $ | 498 |  |  | $ | 430 |
Amortization of debt discount | — |  |  | — |  |  | — |  |  | 17,683 |  |  | 6,251 |
Amortization of issuance costs | 1,307 |  |  | 1,548 |  |  | 242 |  |  | 1,215 |  |  | 743 |
Total interest expense | $ | 1,307 |  |  | $ | 2,003 |  |  | $ | 320 |  |  | $ | 19,396 |  |  | $ | 7,424 |
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.

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