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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
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 |  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator: |  |  |  |  |  |  |  |  |
Net income (in thousands) |  | $ | 44,862 |  |  | $ | 38,827 |  |  | $ | 33,034 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  | 15,466,274 |  |  |  | 15,313,081 |  |  |  | 15,233,858 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of equity grants |  |  | 54,243 |  |  |  | 51,112 |  |  |  | 24,936 |
Adjusted weighted average shares |  |  | 15,520,517 |  |  |  | 15,364,193 |  |  |  | 15,258,794 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 2.90 |  |  | $ | 2.54 |  |  | $ | 2.17 |
Diluted earnings per share |  |  | 2.89 |  |  |  | 2.53 |  |  |  | 2.16 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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