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Convertible Senior Notes (Tables)
 12 Months Ended
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 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):
December 31, 2021
December 31, 2020(1)
2026 Notes2025 Notes2026 Notes2025 Notes2023 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 costs2,635 728 — 
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 costs3,045 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 costs242 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.