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DEBT | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
DEBT | 11. DEBT Convertible senior notes and capped calls Convertible senior notes In February 2020, the Company issued convertible senior notes (the "Notes") with an aggregate principal of $600 million, due March 1, 2025, in a private placement. No principal payments are due before maturity. The Notes accrue interest at an annual rate of 0.75%, payable semi-annually in arrears on March 1 and September 1, beginning September 1, 2020. In 2024 and 2023, the Company recognized gains of $0.5 million and $7.9 million in other income, net from repurchases of Notes representing $34.4 million and $97.7 million in aggregate principal amount, respectively. Conversion rights The conversion rate is 7.4045 shares of common stock per $1,000 principal amount of the Notes, representing an initial conversion price of $135.05 per share of common stock. The conversion rate will be adjusted upon certain events, including spin-offs, tender offers, exchange offers, and certain stockholder distributions. The Company will settle conversions by paying or delivering 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. Beginning on September 1, 2024, noteholders may convert their Notes at any time at their election. Before September 1, 2024, noteholders could convert their Notes in the following circumstances: •During any calendar quarter beginning after June 30, 2020 (and only during such calendar quarter), if the last reported sale price per share of the Company’s common stock exceeds 130% of the conversion price for each of at least 20 trading days (whether or not consecutive) 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 five consecutive trading day period (the “Measurement Period”), if 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 common stock on such trading day and the conversion rate on such trading day. •Upon certain corporate events or distributions or if the Company calls any Notes for redemption, noteholders may convert before the close of business on the business day immediately before the related redemption date (or, if the Company fails to pay the redemption price in full on the redemption date until the Company pays the redemption price). Repurchase rights On or after March 1, 2023 and on or before the 40th scheduled trading day immediately before the maturity date, the Company may redeem for cash all or part of the Notes at a repurchase price equal to 100% of the principal amount, plus accrued and unpaid interest, if the last reported sale price of the Company’s common stock exceeded 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides a redemption notice. If certain corporate events that constitute a “Fundamental Change” occur, each noteholder will have the right to require the Company to repurchase for cash all of such noteholder’s Notes, or any portion of the principal thereof that is equal to $1,000 or a multiple of $1,000, at a repurchase price equal to 100% of the principal amount thereof, plus accrued and unpaid interest. A Fundamental Change relates to mergers, changes in control of the Company, liquidation/dissolution of the Company, or the delisting of the Company’s common stock. Carrying value of the Notes:
(in thousands) | December 31, 2024 |  | December 31, 2023
Principal | $ | 467,864 |  |  | $ | 502,270 |
Unamortized issuance costs | (394) |  |  | (2,902) |
Convertible senior notes, net | $ | 467,470 |  |  | $ | 499,368 |
Interest expense related to the Notes:
(in thousands) | 2024 |  | 2023
Contractual interest expense (0.75% coupon) | $ | 3,725 |  |  | $ | 3,891 |
Amortization of issuance costs | 2,451 |  |  | 2,603 |
| $ | 6,176 |  |  | $ | 6,494 |
The average interest rate on the Notes in 2024 and 2023 was 1.2%. Future payments of principal and contractual interest:
| December 31, 2024
(in thousands) | Principal |  | Interest |  | Total
2025 | $ | 467,864 |  |  | $ | 1,754 |  |  | $ | 469,618 |
| $ | 467,864 |  |  | $ | 1,754 |  |  | $ | 469,618 |
Capped call transactions In February 2020, the Company entered into privately negotiated capped call transactions (the “Capped Call Transactions”) with certain financial institutions. The Capped Call Transactions initially covered approximately 4.4 million shares (representing the number of shares for which the Notes were initially convertible) of the Company’s common stock. In 2024, Capped Call Transactions covering approximately 0.3 million shares were settled for proceeds of $0.01 million. As of December 31, 2024, Capped Call Transactions covering approximately 3.5 million shares were outstanding. The Capped Call Transactions are expected to reduce common stock dilution and/or offset any potential cash payments the Company must make, other than for principal and interest, upon conversion of the Notes, with such reduction and/or offset subject to a cap of $196.44. The cap price of the Capped Call Transactions is subject to adjustment upon specified extraordinary events affecting the Company, including mergers and tender offers. The Capped Call Transactions are accounted for as derivative instruments and do not qualify for the Company’s own equity scope exception in ASC 815 since, in some cases of early settlement, the settlement value calculated following the governing documents may not represent a fair value measurement. The Capped Call Transactions are remeasured to fair value each reporting period, resulting in a non-operating gain or loss. Change in capped call transactions:
(in thousands) | 2024 |  | 2023
January 1, | $ | 893 |  |  | $ | 2,582 |
Settlements | (7) |  |  | (341) |
Fair value adjustment | (663) |  |  | (1,348) |
December 31, | $ | 223 |  |  | $ | 893 |
Credit facility In November 2019, and as since amended, the Company entered into a five-year $100 million senior secured revolving credit agreement (the “Credit Facility”) with PNC Bank, National Association. The Company may use borrowings for general corporate purposes and to finance working capital needs. Subject to specific conditions and the agreement of the financial institutions lending the additional amount, the aggregate commitment may be increased to $200 million. The Credit Facility, as amended, contains customary covenants, including, but not limited to, those relating to additional indebtedness, liens, asset divestitures, and affiliate transactions. Beginning with the fiscal quarter ended March 31, 2024, the Company must maintain a maximum net consolidated leverage ratio of 3.5 to 1.0 (with a step-up for certain acquisitions) and a minimum consolidated interest coverage ratio of 3.5 to 1.0. Effective as of February 4, 2025, the Credit Facility was amended to extend the expiration date to February 4, 2027. As of December 31, 2024 and December 31, 2023, the Company had $27.3 million in outstanding letters of credit under the Credit Facility, reducing available borrowing capacity, but no outstanding cash borrowings.

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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 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: 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