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Earnings (Loss) Per Common Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Earnings (Loss) Per Common Share | 11. Earnings (Loss) Per Common Share The Company calculates earnings (loss) per share using the two-class method. The two-class method allocates net income or loss to each class of common stock and participating security according to common dividends declared and participation rights in undistributed earnings. For reporting periods in which a net loss is recorded, net loss is not allocated to participating securities because the holders of such securities bear no contractual obligation to fund or otherwise share in the losses. Participating securities consist of nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. A summary of the information used in the computation of earnings (loss) per common share follows.
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(in thousands, except per share data) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) to common shareholders |  | $ | 79,356 |  |  | $ | 67,807 |  |  | $ | (148,749 | ) |  | $ | 235,248 |
Net dividends or income allocated to participating securities - basic and diluted |  |  | 1,435 |  |  |  | 1,141 |  |  |  | 1,278 |  |  |  | 3,980 |
Net income (loss) allocated to common shareholders - basic and diluted |  | $ | 77,921 |  |  | $ | 66,666 |  |  | $ | (150,027 | ) |  | $ | 231,268 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares - basic |  |  | 86,358 |  |  |  | 86,377 |  |  | $ | 86,614 |  |  | $ | 85,934 |
Dilutive potential common shares |  |  | 42 |  |  |  | 85 |  |  |  | — |  |  |  | 76 |
Weighted-average common shares - diluted |  |  | 86,400 |  |  |  | 86,462 |  |  | $ | 86,614 |  |  | $ | 86,010 |
Earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.90 |  |  | $ | 0.77 |  |  | $ | (1.73 | ) |  | $ | 2.69 |
Diluted |  | $ | 0.90 |  |  | $ | 0.77 |  |  | $ | (1.73 | ) |  | $ | 2.69 |
Potential common shares consist of stock options, nonvested performance-based awards, and nonvested restricted share awards deferred under the Company’s nonqualified deferred compensation plan. These potential common shares do not enter into the calculation of diluted earnings per share if the impact would be antidilutive, i.e., increase earnings per share or reduce a loss per share. For reporting periods in which a net loss is reported, no effect is given to potentially dilutive common shares in the computation of loss per common share as any impact from such shares would be antidilutive. Potentially dilutive common shares with weighted averages of 78,867 for the three months ended September 30, 2020 and 43,794 and 37,680 for the three and nine months ended September 30, 2019, respectively, were excluded from the calculation of earnings per common share, as the effect would have been antidilutive.

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