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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The total net proceeds from the notes are as follows (in thousands):
2026 Notes2025 Notes2023 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):
September 30, 2021
December 31, 2020 (1)
2026 Notes2025 Notes2026 Notes2025 Notes2023 Notes
Principal$1,000,000 $699,989 $1,000,000 $800,000 $115,576 
Unamortized debt discount— — (226,732)(149,138)(9,953)
Unamortized issuance costs(12,973)(10,267)(11,338)(10,248)(1,245)
Net carrying amount$987,027 $689,722 $761,930 $640,614 $104,378 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.
Schedule Of Interest Expense Recognized
The following tables set forth the total interest expense recognized related to the notes (in thousands):
Three Months Ended September 30,
2021
2020 (1)
2026 Notes2025 Notes2026 Notes2025 Notes2023 Notes
Contractual interest expense$— $221 $— $252 $169 
Amortization of debt discount— — 4,491 8,938 2,458 
Amortization of issuance costs663 749 225 614 292 
Total interest expense$663 $970 $4,716 $9,804 $2,919 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.

Nine Months Ended September 30,
2021
2020 (1)
2026 Notes2025 Notes2023 Notes2026 Notes2025 Notes2023 Notes
Contractual interest expense$— $676 $78 $— $750 $599 
Amortization of debt discount— — — 4,491 26,621 8,709 
Amortization of issuance costs1,970 2,297 242 225 1,829 1,035 
Total interest expense$1,970 $2,973 $320 $4,716 $29,200 $10,343 
(1) As noted above, prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method.