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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2020
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 liability component of the notes is as follows (in thousands):
December 31, 2020December 31, 2019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Principal amount$1,000,000 $800,000 $115,576 $800,000 $345,000 
Unamortized debt discount(226,732)(149,138)(9,953)(184,698)(42,280)
Unamortized issuance costs(11,338)(10,248)(1,245)(12,691)(5,028)
Net carrying amount (liability)$761,930 $640,614 $104,378 $602,611 $297,692 
    
The net carrying amount of the equity component of the notes is as follows (in thousands):
December 31, 2020December 31, 2019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Debt discount for conversion option$241,300 $212,000 $21,505 $212,000 $64,193 
Issuance costs(3,838)(5,253)(586)(5,253)(1,749)
Net carrying amount (equity)$237,462 $206,747 $20,919 $206,747 $62,444 
Schedule Of Interest Expense Recognized The following table sets forth the total interest expense recognized related to the notes (in thousands):
Years Ended December 31,
20202019
2026 Notes2025 Notes2023 Notes2025 Notes2023 Notes
Contractual interest expense$— $1,001 $691 $769 $862 
Amortization of debt discount14,568 35,561 10,073 27,302 12,536 
Amortization of issuance costs728 2,443 1,200 1,876 1,488 
Total interest expense$15,296 $39,005 $11,964 $29,947 $14,886