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Convertible Senior Notes (Tables) | 3 Months Ended
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Mar. 31, 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):
| March 31, 2021 |  | December 31, 2020 (1)
| 2026 Notes |  | 2025 Notes |  | 2023 Notes(2) |  | 2026 Notes |  | 2025 Notes |  | 2023 Notes
Principal | $ | 1,000,000 |  |  | $ | 699,995 |  |  | $ | 110,896 |  |  | $ | 1,000,000 |  |  | $ | 800,000 |  |  | $ | 115,576 |
Unamortized debt discount | — |  |  | — |  |  | — |  |  | (226,732) |  |  | (149,138) |  |  | (9,953) |
Unamortized issuance costs | (14,294) |  |  | (11,755) |  |  | (1,402) |  |  | (11,338) |  |  | (10,248) |  |  | (1,245) |
Net carrying amount | $ | 985,706 |  |  | $ | 688,240 |  |  | $ | 109,494 |  |  | $ | 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. (2) As noted above, during the three months ended March 31, 2021, we elected our option to redeem the remaining outstanding principal amount of 2023 notes and we have classified the remaining net carrying amount of 2023 notes as a current liability.
Schedule Of Interest Expense Recognized | The following table sets forth the total interest expense recognized related to the notes (in thousands):
| Three Months Ended March 31,
| 2021 |  | 2020 (1)
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Contractual interest expense | $ | — |  |  | $ | 237 |  |  | $ | 66 |  |  | $ | 249 |  |  | $ | 215 |
Amortization of debt discount | — |  |  | — |  |  | — |  |  | 8,841 |  |  | 3,125 |
Amortization of issuance costs | 650 |  |  | 808 |  |  | 168 |  |  | 608 |  |  | 372 |
Total interest expense | $ | 650 |  |  | $ | 1,045 |  |  | $ | 234 |  |  | $ | 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.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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