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Earnings Per Share | 12 Months Ended
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Dec. 31, 2016
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) |  | 2016 |  |  | 2015 |  |  | 2014 |
Numerator: |  |  |  |  |  |  |  |  |
Net income |  | $ | 47,346 |  |  | $ | 46,432 |  |  | $ | 43,251 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  | 17,548 |  |  |  | 17,431 |  |  |  | 17,326 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of equity grants |  |  | 18 |  |  |  | 52 |  |  |  | 71 |
Adjusted weighted average shares |  |  | 17,566 |  |  |  | 17,483 |  |  |  | 17,397 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 2.70 |  |  | $ | 2.66 |  |  | $ | 2.50 |
Diluted earnings per share |  |  | 2.70 |  |  |  | 2.66 |  |  |  | 2.49 |
There were no options to purchase common shares that were excluded from the diluted calculations above for the year ended December 31, 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 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. There were no options to purchase common shares that were excluded from the diluted calculations above for the year ended December 31, 2014.

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