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Earnings Per Common Share Computations (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following is a reconciliation of the numerator and denominator of the earnings per common share computations (in thousands, except per share data):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Numerator for basic earnings from continuing operations per common share |  |  |  |  |  |  |
Earnings from continuing operations | $ | 50,298 |  |  | $ | 48,576 |  |  | $ | 51,357 |  |  | $ | 49,930 |
Earnings from continuing operations allocated to participating securities | (1,170 | ) |  | (722 | ) |  | (1,197 | ) |  | (743 | )
Numerator for basic earnings from continuing operations per common share | $ | 49,128 |  |  | $ | 47,854 |  |  | $ | 50,160 |  |  | $ | 49,187 |
Numerator for basic earnings per common share |  |  |  |  |  |  |
Net earnings | $ | 50,298 |  |  | $ | 48,576 |  |  | $ | 51,356 |  |  | $ | 49,929 |
Net earnings allocated to participating securities | (1,170 | ) |  | (723 | ) |  | (1,197 | ) |  | (743 | )
Numerator for basic net earnings per common share | $ | 49,128 |  |  | $ | 47,853 |  |  | $ | 50,159 |  |  | $ | 49,186 |
Numerator for diluted earnings from continuing operations per common share | $ | 50,298 |  |  | $ | 48,576 |  |  | $ | 51,357 |  |  | $ | 49,930 |
Numerator for diluted earnings per common share | $ | 50,298 |  |  | $ | 48,576 |  |  | $ | 51,356 |  |  | $ | 49,929 |
Denominator for net earnings per common share: |  |  |  |  |  |  |
Basic | 17,268 |  |  | 16,978 |  |  | 17,239 |  |  | 16,940 |
Plus dilutive effect of stock options | 242 |  |  | 268 |  |  | 232 |  |  | 247 |
Plus dilutive effect of participating securities | 411 |  |  | 256 |  |  | 411 |  |  | 256 |
Diluted | 17,921 |  |  | 17,502 |  |  | 17,882 |  |  | 17,443 |
Net earnings per common share: |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |
Earnings from continuing operations and net earnings | $ | 2.85 |  |  | $ | 2.82 |  |  | $ | 2.91 |  |  | $ | 2.90 |
Diluted |  |  |  |  |  |  |
Earnings from continuing operations and net earnings | $ | 2.81 |  |  | $ | 2.77 |  |  | $ | 2.87 |  |  | $ | 2.86 |

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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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