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Debt | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Debt | Debt The following table summarizes the balances and availability of our 2026 Notes and 2020 Revolving Credit Facility:
| Outstanding (1) |  | Unutilized Amount |  | Interest Rate |  | Maturity Date
| September 30, 2023 |  | December 31, 2022 |  | September 30, 2023 |  | December 31, 2022 | September 30, 2023 |  | December 31, 2022 |
| (in thousands) |  |  |  |  |  |  |  |
2026 Notes | $ | 366,374 |  |  | $ | 364,505 |  |  | N/A |  | N/A |  | 0.125% |  |  | 0.125% |  |  | Sept. 1, 2026
2020 Revolving Credit Facility | 1,037 |  |  | 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. Convertible Senior Notes On September 17, 2021, the Company issued $373.8 million aggregate principal amount of 0.125% 2026 Notes in a private offering. The initial conversion rate for the 2026 Notes is 20.0024 shares of the Company’s common stock per $1,000 principal amount of 2026 Notes, which is equivalent to an initial conversion price of approximately $49.99 per share of common stock. As of September 30, 2023, the conditions allowing holders of the 2026 Notes to convert were not met. The following table sets forth the interest expense related to the 2026 Notes for the periods presented:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
| (in thousands)
Contractual interest expense | $ | 116 |  |  | $ | 116 |  |  | $ | 350 |  |  | $ | 350 |
Amortization of issuance costs | 624 |  |  | 620 |  |  | 1,869 |  |  | 1,854 |
The effective interest rate on the 2026 Notes was 0.81% for both the three and nine months ended September 30, 2023 and 2022. See Note 3 for additional information on the Company’s 2026 Notes. Credit Agreement The 2020 Credit Agreement provides for the 2020 Revolving Credit Facility of $150.0 million, which may be increased or decreased under specific circumstances, with a $25.0 million letter of credit sublimit and a $50.0 million alternative currency sublimit. In addition, the 2020 Credit Agreement provides for the ability of the Company to request incremental term loan facilities, in a minimum amount of $5.0 million for each facility. The 2020 Credit Agreement contains customary representations and warranties, affirmative covenants, reporting obligations, negative covenants, and events of default. We were in compliance with such covenants as of both September 30, 2023 and December 31, 2022. Effective April 7, 2023, we entered into the Credit Agreement Amendment, which amends certain provisions of the 2020 Credit Agreement. The Credit Agreement Amendment updated the benchmark interest rate provisions to replace the LIBO Rate with the Adjusted Term SOFR for purposes of calculating interest for U.S. dollar-denominated borrowings under the terms of the 2020 Credit Agreement. Except as amended by the Credit Agreement Amendment, the remaining terms of the 2020 Credit Agreement remain in full force and effect. The interest rates applicable to revolving borrowings under the 2020 Credit Agreement are, at the Company’s option, either (i) a base rate, which is equal to the greater of (a) the Prime Rate, (b) the Federal Funds Effective Rate plus 0.50%, and (c) the Adjusted Term SOFR Rate (subject to a floor) for a one month interest period (each term as defined in the 2020 Credit Agreement) plus 1.00%, (ii) the Adjusted Term SOFR Rate (subject to a floor) equal to the Term SOFR Rate for the applicable interest period plus 0.10%, or (iii) the Adjusted LIBO Rate (subject to a floor) equal to the LIBO Rate for the applicable interest period multiplied by the Statutory Reserve Rate, plus in the case of each of clauses (i), (ii), and (iii), the Applicable Rate (each term as defined in the 2020 Credit Agreement). The Applicable Rate (i) for base rate loans range from 0.25% to 1.00% per annum and (ii) for LIBO Rate and Term SOFR Rate loans range from 1.25% to 2.00% per annum, in each case, based on the Senior Secured Net Leverage Ratio (each term as defined in the 2020 Credit Agreement). Base rate borrowings may only be made in dollars. The Company pays a commitment fee during the term of the 2020 Credit Agreement ranging from 0.20% to 0.35% per annum of the average daily undrawn portion of the revolving commitments based on the Senior Secured Net Leverage Ratio.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//470/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I + Details
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