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Convertible Senior Notes | 6 Months Ended
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Jun. 30, 2023
Convertible Senior Notes |
Convertible Senior Notes | Note 9 – Convertible Senior Notes 2027 Notes In December 2022, we issued $690.0 million aggregate principal amount of our 0.50% convertible senior notes due 2027 in a private offering, which aggregate principal amount included the exercise in full of the initial purchasers’ option to purchase up to an additional $90.0 million principal amount of the Notes. The Notes mature on December 15, 2027 and bear interest at a fixed rate of 0.50% per annum, payable semiannually in arrears on June 15 and December 15 of each year, beginning on June 15, 2023. The total net proceeds from the issuance of the Notes, after deducting initial purchasers' discounts and commissions and estimated debt issuance costs of $16.2 million, were approximately $673.8 million. The effective interest rate for the Notes was 0.99% and included interest payable and amortization of debt issuance cost. ​ If we undergo a fundamental change (as defined in the indenture governing the Notes), holders may require us to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, but excluding the fundamental change repurchase date. In addition, following certain corporate events or if we issue a notice of redemption, it will increase the conversion rate for holders who elect to convert their notes in connection with such corporate event or during the relevant redemption period. The following table summarizes the carrying value of the Notes (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, 2023 |  | December 31, 2022
Principal | $ | 690,000 | ​ | $ | 690,000
Unamortized debt issuance costs | ​ | (14,482) | ​ | ​ | (16,033)
Convertible notes carrying amount, net | $ | 675,518 | ​ | $ | 673,967
​ We consider the fair value of the Notes to be a Level 2 measurement. The estimated fair value of the Notes at June 30, 2023 and December 31, 2022 is based on the closing trading price per $1,000 of the Notes as of the last day of trading for each period as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, 2023 |  | December 31, 2022
2027 Notes | $ | 737.9 | ​ | $ | 687.3
​ Interest expense related to the Notes was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, 2023 |  | Six Months Ended June 30, 2023
Contractual interest expense | $ | 862 | ​ | $ | 1,725
Amortization of debt issuance costs | ​ | 775 | ​ | ​ | 1,531
Total interest expense | $ | 1,637 | ​ | $ | 3,256
​ Note Hedge To reduce the impact of potential economic dilution upon conversion of the Notes, we entered into a convertible note hedge transaction (the “Note Hedge” or “2027 Note Hedge”) with certain investment banks, with respect to our common stock, concurrently with the issuance of the 2027 Notes. ​
​ | ​ | ​ | ​ | ​ | ​
​ | Purchase Price | ​ | Shares Purchased
2027 Note Hedge | $ | 194,994 | ​ | ​ | 3,016,680
​ The Note Hedge covers shares of our common stock at a strike price per share that corresponds to the initial conversion price of the respective Notes, subject to adjustment, and is exercisable upon conversion of the Notes. If exercised, we may elect to receive cash, shares of our common stock, or a combination of cash and shares. We have accounted for the aggregate amount of purchase price for the Note Hedge as a reduction to additional paid-in capital. The Note Hedge will expire upon the maturity of the Notes. The Note Hedge is intended to reduce the potential economic dilution upon conversion of the Notes in the event that the fair value per share of our common stock at the time of exercise is greater than the conversion price of the Notes. The Note Hedge is a separate transaction and is not part of the terms of the Notes. Holders of the Notes do not have any rights with respect to the Note Hedge. The Note Hedge does not impact earnings per share, as it was entered into to offset any dilution from the Notes. As of June 30, 2023, 3,016,680 shares remain subject to the Note Hedge. ​ Note Warrants ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Proceeds |  | Shares | ​ | Strike Price | ​ | First Expiration
2027 Warrants | $ | 124,269 | ​ | ​ | 3,016,680 | ​ | $ | 338.86 | ​ | ​ | March 15, 2028
​ Separately, we entered into warrant transactions with certain investment banks, whereby we sold warrants to acquire, subject to adjustment, the number of shares of our common stock shown in the table above. If the average market value per share of our common stock, on each expiration date exceeds the strike price of the Warrants expiring on that day, such Warrants would have a dilutive effect on our earnings per share to the extent we report net income. According to the terms of the Warrants, the Warrants will be automatically exercised over a 60-trading day period beginning on the first expiration date as set forth above.

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