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Earnings Per Share | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | 11. Earnings Per Share Potentially dilutive common stock equivalents for the Company include convertible senior notes, warrants, unvested restricted stock, restricted stock units, and prepaid stock purchase contracts. On October 1, 2021, the Company issued $230.0 million principal amount of 2.00% convertible senior notes due 2026 (the "Notes"). As of September 30, 2023, the maximum number of shares issuable upon settlement of the Notes is 38.3 million (after giving effect to additional shares that would be issuable upon conversion in connection with the occurrence of certain corporate or other events). On July 26, 2020, the Company issued to Ventas, Inc. ("Ventas") a warrant (the "Warrant") to purchase 16.3 million shares of the Company’s common stock, $0.01 par value per share, at a price per share of $3.00. The Warrant is exercisable at Ventas' option at any time and from time to time, in whole or in part, until December 31, 2025. The exercise price and the number of shares issuable on exercise of the Warrant are subject to certain anti-dilution adjustments, including for cash dividends, stock dividends, stock splits, reclassifications, non-cash distributions, certain repurchases of common stock, and business combination transactions. During the three months ended December 31, 2022, the Company issued 2,875,000 of its 7.00% tangible equity units (the "Units") at a public offering price of $50.00 per Unit for an aggregate offering of $143.8 million. Each Unit is comprised of a prepaid stock purchase contract and a senior amortizing note with an initial principal amount of $8.8996. Unless settled early in accordance with the terms of the instruments, under each purchase contract, the Company is obligated to deliver to the holder on November 15, 2025 a minimum of 12.9341, and a maximum of 15.1976, shares of the Company's common stock depending on the daily volume-weighted average price of its common stock for the 20 trading days preceding the settlement date. As of September 30, 2023, the maximum number of shares issuable upon settlement of the Units' prepaid stock purchase contracts is 43.7 million. Basic earnings per share ("EPS") is calculated by dividing net income (loss) by the weighted average number of shares of common stock outstanding, after giving effect to the minimum number of shares issuable upon settlement of the prepaid stock purchase contract component of the Units. For both the three and nine months ended September 30, 2023, 37.2 million shares are included in weighted average basic shares outstanding for the minimum number of shares issuable upon settlement of the Units' prepaid stock purchase contracts.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Weighted average common shares outstanding | 188,230 |  |  | 186,790 |  |  | 187,950 |  |  | 186,493 |
Weighted average minimum shares issuable under purchase contracts | 37,186 |  |  | — |  |  | 37,186 |  |  | — |
Weighted average shares outstanding - basic | 225,416 |  |  | 186,790 |  |  | 225,136 |  |  | 186,493 |
Diluted EPS includes the components of basic EPS and also gives effect to dilutive common stock equivalents. Diluted EPS reflects the potential dilution that could occur if securities or other instruments that are convertible into common stock were exercised or could result in the issuance of common stock. For the purposes of computing diluted EPS, weighted average shares outstanding do not include potentially dilutive securities that are anti-dilutive under the treasury stock method or if-converted method, and performance-based equity awards are included based on the attainment of the applicable performance metrics as of the end of the reporting period. The Company has the following potentially outstanding shares of common stock, which were excluded from the computation of diluted net income (loss) per share attributable to common stockholders in both periods as a result of the net loss.
|  |  | As of September 30,
(in millions) |  |  |  |  | 2023 |  | 2022
Convertible senior notes |  |  |  |  | 38.3 |  |  | 38.3 |
Warrants |  |  |  |  | 16.3 |  |  | 16.3 |
Restricted stock and restricted stock units |  |  |  |  | 6.5 |  |  | 5.4 |
Incremental shares issuable under purchase contracts |  |  |  |  | 6.5 |  |  | — |
Total |  |  |  |  | 67.6 |  |  | 60.0 |

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