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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 common share were computed by dividing earnings on common stock by the weighted average number of shares of common stock outstanding during the applicable period. Diluted earnings per common share were computed by dividing earnings on common stock by the total of the weighted average number of shares of common stock outstanding during the applicable period, plus the effect of nonvested performance share awards and restricted stock units. Common stock outstanding includes issued shares less shares held in treasury. Earnings on common stock was the same for both the basic and diluted earnings per share calculations. A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculations was as follows:
| Three Months Ended
| March 31,
| 2018 |  | 2017 |
| (In thousands)
Weighted average common shares outstanding - basic | 195,304 |  | 195,304 |
Effect of dilutive performance share awards | 678 |  | 719 |
Weighted average common shares outstanding - diluted | 195,982 |  | 196,023 |
Shares excluded from the calculation of diluted earnings per share | — |  | — |

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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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