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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule Of Net Proceeds From Debt Issuance | 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):
| December 31, 2021 |  | December 31, 2020(1)
| 2026 Notes |  | 2025 Notes |  |  |  | 2026 Notes |  | 2025 Notes |  | 2023 Notes
Principal amount | $ | 1,000,000 |  |  | $ | 699,982 |  |  |  |  | $ | 1,000,000 |  |  | $ | 800,000 |  |  | $ | 115,576 |
Unamortized debt discount | — |  |  | — |  |  |  |  | (226,732) |  |  | (149,138) |  |  | (9,953) |
Unamortized issuance costs | (12,309) |  |  | (9,518) |  |  |  |  | (11,338) |  |  | (10,248) |  |  | (1,245) |
Net carrying amount (liability) | $ | 987,691 |  |  | $ | 690,464 |  |  |  |  | $ | 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 table sets forth the total interest expense recognized related to the notes (in thousands):
| Years Ended December 31,
| 2021 |  | 2020(1) |  | 2019(1)
2026 notes: |  |  |  |  |
Amortization of debt discount | $ | — |  |  | $ | 14,568 |  |  | $ | — |
Amortization of issuance costs | 2,635 |  |  | 728 |  |  | — |
Total 2026 notes interest expense | $ | 2,635 |  |  | $ | 15,296 |  |  | $ | — |
2025 notes: |  |  |  |  |
Contractual interest expense | $ | 896 |  |  | $ | 1,001 |  |  | $ | 769 |
Amortization of debt discount | — |  |  | 35,561 |  |  | 27,302 |
Amortization of issuance costs | 3,045 |  |  | 2,443 |  |  | 1,876 |
Total 2025 notes interest expense | $ | 3,941 |  |  | $ | 39,005 |  |  | $ | 29,947 |
2023 notes: |  |  |  |  |
Contractual interest expense | $ | 78 |  |  | $ | 691 |  |  | $ | 862 |
Amortization of debt discount | — |  |  | 10,073 |  |  | 12,536 |
Amortization of issuance costs | 242 |  |  | 1,200 |  |  | 1,488 |
Total 2023 notes interest expense | $ | 320 |  |  | $ | 11,964 |  |  | $ | 14,886 |
(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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