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Convertible Senior Notes | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Convertible Senior Notes | Convertible Senior Notes 0.75% Convertible Senior Notes due 2023 In May 2018, we issued $750.0 million aggregate principal amount of 0.75% convertible senior notes. The net proceeds from the offering, after deducting the initial purchasers' discount and offering expenses, were approximately $733.1 million. The 2023 Notes will be convertible into cash, shares of common stock, or a combination of cash and shares of common stock, at our election, based on an initial conversion rate, subject to adjustment, of 4.0244 shares per $1,000 principal amount of the 2023 Notes which represents an initial conversion price of approximately $248.48 per share. Holders of the 2023 Notes may convert the notes at any time prior to the close of business on the business day immediately preceding November 15, 2022, under any of the following circumstances: (1) during any fiscal quarter (and only during such fiscal quarter) commencing after September 30, 2018, if, for at least 20 trading days (whether or not consecutive) during the 30 consecutive trading day period ending on the last trading day of the immediately preceding fiscal quarter, the last reported sale price of our common stock on such trading day is greater than 130% of the conversion price on such trading day; (2) during the five business day period immediately following any 10 consecutive trading day period, in which the trading price per $1,000 principal amount of notes was less than 98% of the product of the last reported sale price of our common stock on such trading day and the conversion rate on each such trading day; or (3) upon the occurrence of certain specified corporate events as specified in the indenture governing the notes. The notes will have a dilutive effect to the extent the average market price per share of common stock for a given reporting period exceeds the conversion price of $248.48. As of June 30, 2021, the “if-converted value” did not exceed the principal amount of the 2023 Notes. In connection with the issuance of the 2023 Notes, we incurred $16.9 million of issuance costs, which primarily consisted of underwriting, legal and other professional fees. The portion of these costs allocated to the liability component totaling $13.7 million is amortized to interest expense using the effective interest method over the five year expected life of the 2023 Notes. It is our intent and policy to settle conversions through combination settlement, which essentially involves payment in cash equal to the principal portion and delivery of shares of common stock for the excess of the conversion value over the principal portion. During the six months ended June 30, 2021, we repurchased $149.6 million in principal of the 2023 Notes for $153.7 million in cash, including accrued interest of $0.3 million. We accounted for the repurchase as a debt extinguishment, which resulted in (1) a loss of $7.2 million reflected in other income (expense), net, in our condensed consolidated statement of operations for the six months ended June 30, 2021, (2) a $13.5 million reduction in debt discount, and (3) a $10.2 million reduction to additional paid in capital, net of tax, related to the reacquisition of the equity component in our condensed consolidated balance sheet as of June 30, 2021. Convertible Bond Hedge and Warrant Transactions In conjunction with the 2023 Notes, in May 2018, we entered into convertible bond hedges and sold warrants covering 3,018,327 shares of our common stock to minimize the impact of potential dilution to our common stock and/or offset the cash payments we are required to make in excess of the principal amount upon conversion of the 2023 Notes. The convertible bond hedges have an exercise price of $248.48 per share and are exercisable when and if the 2023 Notes are converted. We paid $140.3 million for these convertible bond hedges. If upon conversion of the 2023 Notes, the price of our common stock is above the exercise price of the convertible bond hedges, the counterparties will deliver shares of common stock and/or cash with an aggregate value approximately equal to the difference between the price of common stock at the conversion date and the exercise price, multiplied by the number of shares of common stock related to the convertible bond hedge transaction being exercised. The convertible bond hedges and warrants described below are separate transactions entered into by us and are not part of the terms of the 2023 Notes. Holders of the 2023 Notes and warrants will not have any rights with respect to the convertible bond hedges. Concurrently with the convertible bond hedge transactions, we entered into warrant transactions whereby we sold warrants covering approximately 3,018,327 shares of common stock with an exercise price of approximately $315.38 per share, subject to certain adjustments. We received $90.0 million for these warrants. The warrants have various expiration dates ranging from August 15, 2023 to February 6, 2024. The warrants will have a dilutive effect to the extent the market price per share of common stock exceeds the applicable exercise price of the warrants, as measured under the terms of the warrant transactions. The common stock issuable upon exercise of the warrants will be in unregistered shares, and we do not have the obligation and do not intend to file any registration statement with the SEC registering the issuance of the shares under the warrants. In January 2021, we entered into amendments with Barclays Bank PLC, Deutsche Bank AG, and Goldman Sachs & Co. LLC to the convertible note hedges transactions we initially entered into in connection with the issuance of the 2023 Notes. The amendments provide that the options under the convertible note hedges corresponding to such repurchased 2023 Notes will remain outstanding notwithstanding such repurchase. In March 2021, in connection with the repurchases of $104.5 million in principal of the 2023 Notes for $109.1 million in cash, including accrued interest of $0.2 million, during the quarter ended March 31, 2021, we entered into Warrant Early Unwind Agreements and Bond Hedge Unwind Agreements with Barclays Bank PLC, Deutsche Bank AG, and Goldman Sachs & Co. LLC to unwind a portion of the convertible note hedges transactions we initially entered into in connection with the issuance of the 2023 Notes. We paid $16.5 million as part of the Warrant Early Unwind Agreements reducing the number of shares covered by the warrants from 3,018,327 to 2,597,750. We received $16.9 million as part of the Bond Hedge Early Unwind Agreements reducing the number of options under the convertible bond hedges to 645,500. These unwind transactions resulted in a $0.4 million net increase in additional paid-in-capital in our condensed consolidated balance sheet as of March 31, 2021. The following table summarizes information about the 2023 Notes (in thousands):
| June 30, 2021 |  | December 31, 2020
Principal amount of the 2023 Notes outstanding | $ | 345,729 |  |  | $ | 495,280 |
Unamortized discount (including unamortized debt issuance cost) | (30,411) |  |  | (52,987) |
Total long-term portion of notes payable | $ | 315,318 |  |  | $ | 442,293 |
Carrying value of equity component of the 2023 Notes | $ | 27,776 |  |  | $ | 48,397 |
Fair value of the 2023 Notes outstanding (Level 2) | $ | 341,687 |  |  | $ | 466,053 |

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