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Debt (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The following table summarizes the balances and availability of our 2026 Notes and 2020 Revolving Credit Facility:
Outstanding (1)
Unutilized AmountInterest RateMaturity Date
December 31,
2023		December 31,
2022		December 31,
2023		December 31,
2022		December 31,
2023		December 31,
2022
(in thousands)
2026 Notes$366,999 $364,505 N/AN/A0.125%0.125%Sept. 1, 2026
2020 Revolving Credit Facility1,037 1,037 $148,963 $148,963 1.25%
(2)
1.25%
(2)
July 27, 2025
(1) Represents the net carrying amount of our 2026 Notes and outstanding letters of credit under the 2020 Revolving Credit Facility.
(2) Represents the rate on the outstanding letters of credit under the 2020 Revolving Credit Facility. See further discussion on the interest rate applicable to borrowings under the 2020 Revolving Credit Facility below.
Schedule of interest expense
The following table sets forth the interest expense related to the 2026 Notes for the periods presented:
Years Ended December 31,
202320222021
(in thousands)
Contractual interest expense$467 $467 $135 
Amortization of issuance costs2,494 2,474 711