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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule 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:
Year ended December 31 (In thousands, except share data) |  | 2020 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |
Net income |  | $ | 127,923 |  |  | $ | 102,700 |  |  | $ | 110,387 |
Denominator: |  |  |  |  |  |
Weighted-average common shares outstanding |  | 16,302,825 |  |  | 16,234,342 |  |  | 15,488,982 |
Effect of dilutive PBRSUs and TBRSUs |  | 104,677 |  |  | 95,114 |  |  | 122,507 |
Weighted-average common shares outstanding adjusted for the effect of dilutive PBRSUs and TBRSUs |  | 16,407,502 |  |  | 16,329,456 |  |  | 15,611,489 |
Earnings per common share: |  |  |  |  |  |
Basic earnings per common share |  | $ | 7.85 |  |  | $ | 6.33 |  |  | $ | 7.13 |
Diluted earnings per common share |  | $ | 7.80 |  |  | $ | 6.29 |  |  | $ | 7.07 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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