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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Summary Of Computation Of Basic And Diluted Earnings Per Common Share | The following table sets forth the computation of basic and diluted earnings per common share for the three months ended March 31, 2018 and 2017.
|  | Three Months Ended March 31,
(In thousands, except share and per common share data) |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |
Net income |  | $ | 31,123 |  |  | $ | 20,267 |
Denominator: |  |  |  |  |  |
Weighted-average common shares outstanding |  | 15,288,332 |  |  | 15,312,059 |
Effect of dilutive performance-based restricted stock units |  | 142,996 |  |  | 120,710 |
Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units |  | 15,431,328 |  |  | 15,432,769 |
Earnings per common share: |  |  |  |  |  |
Basic earnings per common share |  | $ | 2.04 |  |  | $ | 1.32 |
Diluted earnings per common share |  | $ | 2.02 |  |  | $ | 1.31 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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