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Long-term Debt
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Long-term Debt Long-term Debt
Revolving Credit Facility

On March 29, 2023, the Company amended and restated its existing credit agreement by entering into a Second Amended and Restated Credit Agreement (the “2023 Credit Agreement”) with Wells Fargo Bank, National Association, as administrative agent and the other lenders parties thereto. The 2023 Credit Agreement provides for revolving credit borrowings up to a maximum principal amount of $300.0 million, subject to a commitment increase of $75.0 million. All outstanding amounts owed under the 2023 Credit Agreement become due and payable no later than the final maturity date of March 29, 2028. As of September 30, 2023, there was no outstanding balance under the 2023 Credit Agreement. The Company incurred $0.8 million of additional deferred finance fees during the nine months ended September 30, 2023.

The 2023 Credit Agreement also allows for the issuance of letters of credit in the aggregate amount of up to $10.0 million at any one time; outstanding letters of credit reduce the credit available for revolving credit borrowings. As of September 30, 2023, there were no outstanding letters of credit. Substantially all of the Company’s assets are pledged to secure the credit facility.

Borrowings under the 2023 Credit Agreement bear interest at the Company’s option of the prime rate (8.50% on September 30, 2023) plus a margin ranging from 0.00% to 1.00% or one month Secured Overnight Financing Rate (“SOFR”) (5.31% on September 30, 2023) plus a margin ranging from 1.00% to 2.00%. The Company incurs an annual commitment fee of 0.15% to 0.20% on the unused portion of the line of credit. The additional margin amount and annual commitment fee are dependent on the level of outstanding borrowings. As of September 30, 2023, the Company had $300.0 million of unused borrowing capacity.

The Company is required to comply with various financial covenants under the 2023 Credit Agreement. At September 30, 2023, the Company was in compliance with all covenants under the 2023 Credit Agreement.

Convertible Senior Notes due 2026

On November 9, 2021, the Company issued $380.0 million aggregate principal amount of 0.125% Convertible Senior Notes Due 2026 (the “2026 Notes”) in a private placement to qualified institutional buyers pursuant to an exemption from registration provided by Section 4(a)(2) and Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The 2026 Notes bear interest at a rate of 0.125% per year. Interest is payable in cash on May 15 and November 15 of each year, with the first payment made on May 15, 2022. The 2026 Notes mature on November 15, 2026 unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. The initial conversion rate is 5.2100 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 $191.94 per share of common stock. After consideration of the 2026 Notes Hedges and 2026 Notes Warrants (as defined and described below), the conversion rate is effectively hedged to a price of $295.29 per share of common stock. The conversion rate, and thus the conversion price, may be adjusted under certain circumstances as described in the indenture
governing the 2026 Notes (the “2026 Indenture”). The Company may settle conversions by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company’s election, based on the applicable conversion rate(s). If a “make-whole fundamental change” (as defined in the 2026 Indenture) occurs, then the Company will in certain circumstances increase the conversion rate for a specified period of time. The Company’s intent is to settle the principal amount of the 2026 Notes in cash upon conversion.

Convertible Senior Notes due 2025

On August 14, 2020, the Company issued $230.0 million aggregate principal amount of 1.250% Convertible Senior Notes Due 2025 (the “2025 Notes”) in a private placement to qualified institutional purchasers pursuant to an exemption from registration provided by Section 4(a)(2) and Rule 144A under the Securities Act. The 2025 Notes bear interest at a rate of 1.250% per year. Interest is payable in cash on February 1 and August 1 of each year. The 2025 Notes mature on August 1, 2025 unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. The initial conversion rate is 19.3538 shares of the Company’s common stock per $1,000 principal amount of 2025 Notes, which is equivalent to an initial conversion price of approximately $51.67 per share of common stock. After consideration of the 2025 Notes Hedges and 2025 Notes Warrants (as defined and described below), the conversion rate is effectively hedged to a price of $81.05 per share of common stock. The conversion rate, and thus the conversion price, may be adjusted under certain circumstances as described in the indenture governing the 2025 Notes (the “2025 Indenture”). The Company may settle conversions by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company’s election, based on the applicable conversion rate(s). If a “make-whole fundamental change” (as defined in the 2025 Indenture) occurs, then the Company will in certain circumstances increase the conversion rate for a specified period of time. The Company’s intent is to settle the principal amount of the 2025 Notes in cash upon conversion.

Other Terms of the Notes

The 2025 Notes and 2026 Notes may be converted at the holder’s option prior to the close of business on the business day immediately preceding August 1, 2025 for the 2025 Notes and November 15, 2026 for the 2026 Notes, but only under the following circumstances:

•during any calendar quarter commencing after the calendar quarter ending on September 30, 2020 for the 2025 Notes and December 31, 2021 for the 2026 Notes, if the last reported sale price per share of the Company’s common stock exceeds 130% of the applicable conversion price for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;
•during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company’s common stock on such trading day and the applicable conversion rate on such trading day;
•upon the occurrence of certain corporate events or distributions on the Company’s common stock described in the 2025 Indenture and 2026 Indenture; and
•at any time from, and including, February 3, 2025 for 2025 Notes and May 15, 2026 for 2026 Notes, until the close of business on the second scheduled trading day immediately before the maturity date for the 2025 Notes and 2026 Notes.

The Company may not redeem the 2025 Notes and 2026 Notes at its option before maturity. If a “fundamental change” (as defined in the 2025 Indenture and 2026 Indenture) occurs, then, except as described in the 2025 Indenture and 2026 Indenture, noteholders may require the Company to repurchase their 2025 Notes and 2026 Notes at a cash repurchase price equal to the principal amount of the 2025 Notes and 2026 Notes to be repurchased, plus accrued and unpaid interest, if any.

As of September 30, 2023, none of the conditions permitting holders to convert their 2025 Notes and 2026 Notes had been satisfied and no shares of the Company’s common stock had been issued in connection with any conversions of the 2025 Notes and 2026 Notes during the nine months ended September 30, 2023. Based on the closing price of the Company's common stock of $57.86 per share on September 30, 2023, the conversion value of the 2026 Notes was less than the principal amount of the 2026 Notes outstanding on a per note basis, and the conversion value of the 2025 Notes was greater than the principal amount of the 2025 Notes outstanding on a per note basis.

The 2025 Notes and 2026 Notes consisted of the following (in millions):
 September 30, 2023 (unaudited)
Long-term debt:2026 Notes2025 Notes
     Principal$380.0 $23.3 
     Less: Unamortized debt issuance costs(6.7)(0.3)
Net carrying amount$373.3 $23.0 

 December 31, 2022
Long-term debt:2026 Notes2025 Notes
     Principal$380.0 $23.3 
     Less: Unamortized debt issuance costs(8.3)(0.4)
Net carrying amount$371.7 $22.9 

Interest expense for the three and nine months ended September 30, 2023 and 2022 related to the 2026 Notes and 2025 Notes consisted of the following (in millions):

2026 Notes
Three Months EndedNine Months Ended
September 30,September 30,
2023202220232022
Coupon interest$0.1 $0.1 $0.4 $0.4 
Amortization of debt issuance costs0.6 0.6 1.6 1.6 
     Total interest expense recognized$0.7 $0.7 $2.0 $2.0 


2025 Notes
Three Months EndedNine Months Ended
September 30,September 30,
2023202220232022
Coupon interest$0.1 $0.1 $0.2 $0.2 
Amortization of debt issuance costs— — 0.1 0.1 
     Total interest expense recognized$0.1 $0.1 $0.3 $0.3 

Convertible Notes Hedges

In connection with the issuance of the 2026 Notes and 2025 Notes, the Company entered into privately negotiated convertible note hedge transactions (the “2026 Notes Hedges” and the “2025 Notes Hedges”), and together, the “Notes Hedges”) with certain of the initial purchasers or their respective affiliates and/or other financial institutions (the “Option Counterparties”). As of September 30, 2023, the 2026 Notes Hedges provide the Company with the option to acquire, on a net settlement basis, approximately 2.0 million shares of common stock at a strike price of $191.94, which is equal to the number of shares of common stock that notionally underlie the 2026 Notes and correspond to the conversion price of the 2026 Notes. As of September 30, 2023, the 2025 Notes Hedges provided the Company with the option to acquire, on a net settlement basis, approximately 0.5 million shares of common stock at a strike price of $51.67, which is equal to the number of shares of common stock that notionally underlie the 2025 Notes and correspond to the conversion price of the 2025 Notes. If the Company elects cash settlement and exercises the Notes Hedges, the aggregate amount of cash received from the Option Counterparties will cover the aggregate amount of cash that the Company would be required to pay to the holders of the Notes, less the principal amount thereof. The Notes Hedges do not meet the criteria for separate accounting as a derivative as they are indexed to the Company’s stock and are accounted for as freestanding financial instruments.

Convertible Notes Warrants
In connection with the issuance of the 2026 Notes and 2025 Notes, the Company also sold net-share-settled warrants (the “2026 Notes Warrants”, and the “2025 Notes Warrants,” respectively, and together, the “Notes Warrants”) in privately negotiated transactions with the Option Counterparties. The strike price of the 2026 Notes Warrants and 2025 Notes Warrants was approximately $295.29 and $81.05 per share, respectively, and is subject to certain adjustments under the terms of their respective Notes Warrants. As a result of the 2026 Notes Warrants and 2025 Notes Warrants and related transactions, the Company is required to recognize incremental dilution of earnings per share to the extent the average share price for any fiscal quarter is over $295.29 for the 2026 Notes Warrants and $81.05 for the 2025 Notes Warrants. The 2026 Notes Warrants and the 2025 Notes Warrants expire over a period of 80 trading days commencing on February 15, 2027 and over a period of 100 trading days commencing on November 1, 2025, respectively, and may be settled in net shares of common stock or net cash at the Company’s election. As of September 30, 2023, 2.0 million warrant shares and 0.5 million warrant shares were outstanding for the 2026 Notes Warrants and 2025 Notes Warrants, respectively.