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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | 23. 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 |
There were no options to purchase common shares that were excluded from the diluted calculations above for the years ended December 31, 2017 and 2016. In addition to in-the-money stock options, unvested restricted stock grants were also used in the calculation of diluted earnings per share based on the treasury method. Options to purchase 58,063 common shares at a weighted average price of $35.409 were excluded from the diluted calculations above for the year ended December 31, 2015, because the exercise prices on the options were greater than the average market price for the period.

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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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