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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2018 and 2017.
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands, except share and per common share data) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 28,241 |  |  | $ | 19,032 |  |  | $ | 59,364 |  |  | $ | 39,299 |
Denominator: |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  | 15,285,532 |  |  | 15,297,085 |  |  | 15,286,932 |  |  | 15,304,572 |
Effect of dilutive performance-based restricted stock units |  | 132,075 |  |  | 101,780 |  |  | 137,653 |  |  | 111,193 |
Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units |  | 15,417,607 |  |  | 15,398,865 |  |  | 15,424,585 |  |  | 15,415,765 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share |  | $ | 1.85 |  |  | $ | 1.24 |  |  | $ | 3.88 |  |  | $ | 2.57 |
Diluted earnings per common share |  | $ | 1.83 |  |  | $ | 1.24 |  |  | $ | 3.85 |  |  | $ | 2.55 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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