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Debt Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Carrying Values of Debt Agreements
The following table reflects the carrying values of the debt agreements as of September 30, 2021:
As of September 30, 2021
(in thousands)
Convertible Senior notes (effective interest rate of 0.40%)
Principal amount$948,750 
Less: unamortized debt issuance costs(16,445)
Less: current portion of long-term debt— 
Long-term debt, less current portion$932,305