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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Summary of Earnings per share |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 68.3 |  |  | $ | 48.9 |  |  | $ | 73.7 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 23,187 |  |  |  | 23,568 |  |  |  | 23,756 |
Dilutive effect of stock options and awards |  |  | 663 |  |  |  | 952 |  |  |  | 1,058 |
Denominator for diluted earnings per share |  |  | 23,850 |  |  |  | 24,520 |  |  |  | 24,814 |
Net income per share, basic: |  | $ | 2.95 |  |  | $ | 2.07 |  |  | $ | 3.10 |
Net income per share, diluted: |  | $ | 2.86 |  |  | $ | 1.99 |  |  | $ | 2.97 |

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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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