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Debt | 12 Months Ended
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Dec. 31, 2023
Debt Disclosure [Abstract] |
Debt | Debt Convertible Senior Notes The Company has three convertible senior notes ("2029 Notes", "2027 Notes" and "2025 Notes") outstanding with a par value totaling $3,565.0 million (collectively, the "Notes") that are senior unsecured obligations of the Company and bear interest payable semi-annually in arrears. The following table summarizes further details of the Notes:
Notes |  | Issuance Date |  | Maturity Date |  | Principal Amount (in thousands) |  | Coupon Interest Rate |  | Effective Interest Rate
2029 Notes |  | August 18, 2023 |  | February 15, 2029 |  | $ | 1,265,000 |  |  | 1.125 | % |  | 1.388 | %
2027 Notes |  | August 16, 2019 |  | September 1, 2027 |  | $ | 1,150,000 |  |  | 0.375 | % |  | 0.539 | %
2025 Notes |  | May 21, 2018 |  | May 1, 2025 |  | $ | 1,150,000 |  |  | 0.125 | % |  | 0.350 | %
Conversion Rights of the Notes At their option, holders may exercise the conversion right of the respective Notes at the following specified times and rates to receive the principal amount in cash and receive any amount in excess of the principal amount in cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock, at the Company’s election. Prior to the close of business on the business day immediately preceding the conversion date, as noted in the table below, under the following circumstances a holder may exercise their conversion right: •during any calendar quarter commencing after the calendar quarter ended December 31, 2023 for the 2029 Notes, December 31, 2019 for the 2027 Notes and June 30, 2018 for the 2025 Notes (and only during such calendar quarter), if the last reported sale price of the Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; •during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the respective Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or •upon the occurrence of specified corporate events. On or after the respective conversion date, as noted in the table below, holders may convert all or any portion of their respective Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date. If the Company undergoes a fundamental change at any time prior to the maturity date, holders of the Notes will have the right, at their option, to require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest up to, but excluding, the fundamental change repurchase date. The conversion rights of the Notes are as follows:
Notes |  | Conversion Date |  | Conversion Rate (1) |  | Conversion Price per Share (1) |  |
2029 Notes |  | October 15, 2028 |  | 7.9170 |  | $ | 126.31 |  |  |
2027 Notes |  | May 1, 2027 |  | 8.6073 |  | $ | 116.18 |  |  |
2025 Notes |  | January 1, 2025 |  | 10.5150 |  | $ | 95.10 |  |  |
(1) The conversion rate for the Notes is established as a number of shares of the Company's commons stock per $1,000 principal amount of the Notes, that is equivalent to the conversion price per share, subject to adjustments in certain events. Upon the occurrence of certain corporate events the Company will increase the conversion rate for a holder that elects to convert its Notes. Components and Fair Value of the Notes The Notes consisted of the following components as of December 31, 2023 and 2022 (in thousands):
| 2029 Notes |  | 2027 Notes |  | 2025 Notes |  | Total
As of December 31, 2023 |  |  |  |  |  |  |
Principal | $ | 1,265,000 |  |  | $ | 1,150,000 |  |  | $ | 1,150,000 |  |  | $ | 3,565,000 |
Less: issuance costs, net of amortization | (16,478) |  |  | (6,831) |  |  | (3,462) |  |  | (26,771) |
Net carrying amount | $ | 1,248,522 |  |  | $ | 1,143,169 |  |  | $ | 1,146,538 |  |  | $ | 3,538,229 |
Estimated fair value (1) | $ | 1,376,915 |  |  | $ | 1,289,219 |  |  | $ | 1,467,274 |  |  | $ | 4,133,408 |
As of December 31, 2022 |  |  |  |  |  |  |
Principal | $ | — |  |  | $ | 1,150,000 |  |  | $ | 1,150,000 |  |  | $ | 2,300,000 |
Less: issuance costs, net of amortization | — |  |  | (8,707) |  |  | (6,035) |  |  | (14,742) |
Net carrying amount | $ | — |  |  | $ | 1,141,293 |  |  | $ | 1,143,965 |  |  | $ | 2,285,258 |
Estimated fair value (1) | $ | — |  |  | $ | 1,111,038 |  |  | $ | 1,209,076 |  |  | $ | 2,320,114 |
(1) The fair values were determined based on the quoted prices of the Notes in an inactive market on the last trading day of the reporting period and have been classified as Level 2 within the fair value hierarchy. Note Hedges and Warrants To minimize the impact of potential dilution upon conversion of the Notes, the Company entered into convertible note hedge transactions with respect to its common stock concurrently with each respective note issuance. The note hedge transactions cover an approximate number of shares of the Company’s common stock at a strike price that corresponds to the conversion prices for the Notes, also subject to adjustment, and are exercisable upon conversion of the Notes. The note hedge transactions expire upon the respective maturity dates of the Notes. The Company determined that the note hedges meet the definition of a derivative and are classified in stockholders’ equity, as the note hedges are indexed to the Company's common stock, and the Company, at its election, may receive cash, shares of the Company's common stock or a combination of cash and shares of the Company's common stock. The Company recorded the purchase of the hedges as a decrease to additional paid-in capital. The Company does not recognize subsequent changes in fair value of the note hedges in its consolidated financial statements. Separately, the Company also entered into warrant transactions concurrently with each of the note issuances, whereby the Company sold warrants to acquire, subject to anti-dilution adjustments, shares of the Company’s common stock at a predetermined strike price per share. The convertible note hedge and warrant transactions will generally have the effect of increasing the conversion price of each of the Notes to the respective strike price related to the warrant transactions. The Company determined that the warrants meet the definition of a derivative and are classified in stockholders’ equity, as the warrants are indexed to the Company's common stock, and the Company, at its election, may pay or deliver to holders cash or shares of the Company's common stock. The Company recorded the proceeds from the issuance of the warrants as an increase to additional paid-in capital. The Company does not recognize subsequent changes in fair value of the warrants in its consolidated financial statements. The following table summarizes the main terms impacting the note hedges and warrants (in thousands, except per share data):
| 2029 Notes |  | 2027 Notes |  | 2025 Notes
Note hedge transaction costs | $ | 236,555 |  |  | $ | 312,225 |  |  | $ | 261,740 |
Shares covered by note hedge transactions | 10,015 |  |  | 9,898 |  |  | 12,093 |
Shares related to warrant transactions | 10,015 |  |  | 9,898 |  |  | 12,093 |
Strike price per share related to warrant transactions | $ | 180.44 |  |  | $ | 178.74 |  |  | $ | 149.18 |
Aggregate proceeds from sale of warrants | $ | 90,195 |  |  | $ | 185,150 |  |  | $ | 119,945 |
Revolving Credit Facility In May 2018, the Company entered into a $500.0 million five-year, revolving credit agreement (the “2018 Credit Agreement”). Borrowings under the 2018 Credit Agreement bore interest, at the Company's option, at a base rate plus a spread of 0.00% to 0.25% or an adjusted LIBOR rate plus a spread of 0.875% to 1.25%, in each case with such spread being determined based on the Company's consolidated leverage ratio specified in the 2018 Credit Agreement. Regardless of what amounts, if any, outstanding under the 2018 Credit Agreement, the Company was also obligated to pay an ongoing commitment fee on undrawn amounts at a rate of 0.075% to 0.15%, with such rate being based on the Company's consolidated leverage ratio specified in the 2018 Credit Agreement. In November 2022, the Company entered into a $500.0 million five-year, revolving credit agreement (the “2022 Credit Agreement”). The 2022 Credit Agreement replaces the 2018 Credit Agreement. Borrowings under the 2022 Credit Agreement may be used to finance working capital needs and for general corporate purposes. The 2022 Credit Agreement provides for an initial $500.0 million in revolving loans. Under specified circumstances, the facility can be increased to up to $1.0 billion in aggregate principal amount. The 2022 Credit Agreement expires, and any amounts outstanding thereunder will become due and payable, on November 22, 2027, subject to up to two one-year extensions at the Company's request and with the consent of the lenders party thereto. Borrowings under the 2022 Credit Agreement bear interest, at the Company's option, and subject to a credit spread adjustment, at a term benchmark rate plus a spread of 0.75% to 1.125%, a reference rate plus a spread of 0.75% to 1.125%, or a base rate plus a spread of 0.00% to 0.125%, in each case with such spread being determined based on the Company's consolidated leverage ratio specified in the 2022 Credit Agreement. Regardless of what amounts, if any, are outstanding under the 2022 Credit Agreement, the Company is also obligated to pay an ongoing commitment fee on undrawn amounts at a rate of 0.07% to 0.125%, with such rate being based on the Company's consolidated leverage ratio specified in the 2022 Credit Agreement. The 2022 Credit Agreement contains customary representations and warranties, affirmative and negative covenants and events of default. The negative covenants include restrictions on subsidiary indebtedness, liens and fundamental changes. These covenants are subject to a number of important exceptions and qualifications. The principal financial covenant requires a maximum consolidated leverage ratio. There were no outstanding borrowings under the 2022 Credit Agreement as of December 31, 2023. Interest Expense The Notes bear interest at fixed rates that are payable semi-annually in arrears on their respective interest payment dates each year. Interest expense, together with ongoing commitment fees under the terms of the Company's credit agreements, included in the consolidated statements of income for the years ended December 31, 2023, 2022 and 2021 was as follows (in thousands):
| 2023 |  | 2022 |  | 2021
Amortization of debt discount and issuance costs | $ | 5,803 |  |  | $ | 4,688 |  |  | $ | 69,697 |
Coupon interest payable on 2029 Notes | 5,218 |  |  | — |  |  | — |
Coupon interest payable on 2027 Notes | 4,312 |  |  | 4,312 |  |  | 4,313 |
Coupon interest payable on 2025 Notes | 1,436 |  |  | 1,437 |  |  | 1,437 |
Interest payable and commitment fees under the credit agreements | 1,402 |  |  | 952 |  |  | 557 |
Capitalization of interest expense | (462) |  |  | (293) |  |  | (3,672) |
Total interest expense | $ | 17,709 |  |  | $ | 11,096 |  |  | $ | 72,332 |
Prior to the adoption of the new guidance for accounting for convertible instruments on January 1, 2022, the Company also amortized as interest expense the value of debt discounts of the 2027 Notes and the 2025 Notes.

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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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