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Earnings Per Share | 3 Months Ended
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Mar. 31, 2020
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Earnings Per Share | Note 11: Earnings Per Share Earnings per share is calculated using the two-class method in which earnings are allocated to common stock and participating securities based on their rights to receive nonforfeitable dividends or dividend equivalents. The Company grants restricted stock to certain employees and non-employee directors in accordance with the Company’s long-term incentive programs, which entitle the participants to receive nonforfeitable dividends or dividend equivalents during the vesting period on the same basis as those dividends are paid to common shareholders. These unvested stock awards represent participating securities. During periods of net income, the calculation of earnings per share exclude the income attributable to participating securities in the numerator and the dilutive impact of these securities from the denominator. During periods of net loss, no effect is given to participating securities in the numerator and the denominator excludes the dilutive impact of these securities since they do not share in the losses of the Company. Basic earnings per share excludes dilution and is computed by dividing net income (loss) available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects the dilutive effect of all unvested restricted stock outstanding during the period that could potentially result in the issuance of common stock. The dilution from unvested restricted stock is calculated by applying the two-class method and using the treasury stock method. The treasury stock method assumes the proceeds from the unrecognized compensation expense from unvested restricted stock will be used to purchase shares of the Company’s common stock at the average market price during the period. If the potentially dilutive securities disclosed in the table below become vested, the transaction would be net share settled resulting in a significantly lower impact to the outstanding share balance in comparison to the total amount of the potentially dilutive securities. During periods of net loss, unvested restricted stock is excluded from the calculation because they would have an antidilutive affect. Therefore, in periods of net loss, the calculation of basic and diluted earnings per share would result in the same value. The following table presents the computation of basic and diluted earnings per share for the three months ended March 31, 2020 and 2019:
|  | Three Months Ended March 31,
In millions except per share amounts |  | 2020 |  | 2019 |
Basic earnings per share: |  |  |  |  |  |  |  |
Net income (loss) available to common shareholders |  |  | (333 | ) |  |  | (21 | )
Basic weighted average shares (1) |  |  | 72.1 |  |  |  | 85.6 |
Net income (loss) per basic common share |  | $ | (4.62 | ) |  | $ | (0.24 | )
Diluted earnings per share: |  |  |  |  |  |  |  |
Net income (loss) available to common shareholders |  |  | (333 | ) |  |  | (21 | )
Diluted weighted average shares (1) |  |  | 72.1 |  |  |  | 85.6 |
Net income (loss) per diluted common share |  | $ | (4.62 | ) |  | $ | (0.24 | )
Potentially dilutive securities excluded from the calculation of diluted EPS because of antidilutive affect |  |  | 4.9 |  |  |  | 4.5 |
(1) - | Includes 0.9 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for each of the three months ended March 31, 2020 and 2019, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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