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Earnings Per Common Share Computations (Tables) | 6 Months Ended
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Jun. 30, 2012
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,
| 2012 |  | 2011 |  | 2012 |  | 2011
Numerator for basic earnings from continuing operations per common share: |  |  |  |  |  |  |
Earnings from continuing operations | $ | 48,576 |  |  | $ | 39,990 |  |  | $ | 49,930 |  |  | $ | 36,804 |
Earnings from continuing operations allocated to participating securities | (722 | ) |  | (906 | ) |  | (743 | ) |  | (869 | )
Numerator for basic earnings from continuing operations per common share | $ | 47,854 |  |  | $ | 39,084 |  |  | $ | 49,187 |  |  | $ | 35,935 |
Numerator for basic earnings per common share: |  |  |  |  |  |  |
Net earnings | $ | 48,576 |  |  | $ | 40,147 |  |  | $ | 49,929 |  |  | $ | 36,962 |
Net earnings allocated to participating securities | (723 | ) |  | (910 | ) |  | (743 | ) |  | (873 | )
Numerator for basic net earnings per common share | $ | 47,853 |  |  | $ | 39,237 |  |  | $ | 49,186 |  |  | $ | 36,089 |
Numerator for diluted earnings per common share: |  |  |  |  |  |  |
Earnings from continuing operations | $ | 48,576 |  |  | $ | 39,990 |  |  | $ | 49,930 |  |  | $ | 36,804 |
Discontinued operations, net of income taxes | — |  |  | 157 |  |  | (1 | ) |  | 158 |
Net earnings | $ | 48,576 |  |  | $ | 40,147 |  |  | $ | 49,929 |  |  | $ | 36,962 |
Denominator for net earnings per common share: |  |  |  |  |  |  |
Basic | 16,978 |  |  | 16,444 |  |  | 16,940 |  |  | 16,401 |
Plus dilutive effect of stock options | 268 |  |  | 109 |  |  | 247 |  |  | 100 |
Plus dilutive effect of participating securities | 256 |  |  | 382 |  |  | 256 |  |  | 398 |
Diluted | 17,502 |  |  | 16,935 |  |  | 17,443 |  |  | 16,899 |
Net earnings per common share: |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |
Earnings from continuing operations | $ | 2.82 |  |  | $ | 2.38 |  |  | $ | 2.90 |  |  | $ | 2.19 |
Discontinued operations | $ | — |  |  | $ | 0.01 |  |  | $ | — |  |  | $ | 0.01 |
Net earnings | $ | 2.82 |  |  | $ | 2.39 |  |  | $ | 2.90 |  |  | $ | 2.20 |
Diluted |  |  |  |  |  |  |
Earnings from continuing operations | $ | 2.77 |  |  | $ | 2.36 |  |  | $ | 2.86 |  |  | $ | 2.18 |
Discontinued operations | $ | — |  |  | $ | 0.01 |  |  | $ | — |  |  | $ | 0.01 |
Net earnings | $ | 2.77 |  |  | $ | 2.37 |  |  | $ | 2.86 |  |  | $ | 2.19 |

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