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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
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:
|  | Three Months Ended |
|  | March 31 |
(in thousands except per share data) |  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |
Net income |  | $ | 11,820 |  |  | $ | 11,869 |
Denominator: |  |  |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |
Weighted average shares |  |  | 15,539 |  |  |  | 15,407 |
Diluted earnings per share: |  |  |  |  |  |  |  |
Effect of dilutive stock options |  |  | 53 |  |  |  | 49 |
Adjusted weighted average shares |  |  | 15,592 |  |  |  | 15,456 |
Earnings per share: |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 0.76 |  |  | $ | 0.77 |
Diluted earnings per share |  |  | 0.76 |  |  |  | 0.77 |

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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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