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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share | The following table sets forth the computation of basic and diluted earnings per share:
Year Ended December 31 (in thousands except per share data) |  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |
Net income |  | $ | 51,493 |  |  | $ | 47,346 |  |  | $ | 46,432 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  | 17,631 |  |  |  | 17,548 |  |  |  | 17,431 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of equity grants |  |  | 22 |  |  |  | 18 |  |  |  | 52 |
Adjusted weighted average shares |  |  | 17,653 |  |  |  | 17,566 |  |  |  | 17,483 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 2.92 |  |  | $ | 2.70 |  |  | $ | 2.66 |
Diluted earnings per share |  |  | 2.92 |  |  |  | 2.70 |  |  |  | 2.66 |

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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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