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Earnings per Common Share | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Earnings per Common Share | Earnings per Common Share Basic earnings per share (EPS) is computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted EPS is similarly calculated except that the common shares outstanding for the period is increased using the treasury stock method to reflect the potential dilution that could occur if outstanding stock appreciation rights were exercised and stock awards were vested at the end of the applicable period. Anti-dilutive shares represent potentially dilutive securities that are excluded from the computation of diluted income or loss per share as their impact would be anti-dilutive. The following is a calculation of basic and diluted weighted-average shares outstanding:
|  | Three Months Ended March 31,
(In thousands) |  | 2018 |  | 2017
Weighted-average shares - basic |  | 459,715 |  |  | 465,348 |
Dilution effect of stock appreciation rights and stock awards at end of period |  | 1,834 |  |  | 1,540 |
Weighted-average shares - diluted |  | 461,549 |  |  | 466,888 |
The following is a calculation of weighted-average shares excluded from diluted EPS due to the anti-dilutive effect:
|  | Three Months Ended March 31,
(In thousands) |  | 2018 |  | 2017
Weighted-average stock appreciation rights and stock awards excluded from diluted EPS due to the anti-dilutive effect calculated using the treasury stock method |  | 608 |  |  | 477 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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