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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Per share amounts are computed as follows:
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30 |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 17.1 |  |  | $ | 15.5 |  |  | $ | 35.1 |  |  | $ | 40.1 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 23,528 |  |  |  | 23,147 |  |  |  | 23,466 |  |  |  | 23,101 |
Dilutive effect of stock options and awards |  |  | 529 |  |  |  | 747 |  |  |  | 607 |  |  |  | 719 |
Denominator for diluted earnings per share |  |  | 24,057 |  |  |  | 23,894 |  |  |  | 24,073 |  |  |  | 23,820 |
Net income per share, basic: |  | $ | 0.73 |  |  | $ | 0.67 |  |  | $ | 1.50 |  |  | $ | 1.74 |
Net income per share, diluted: |  | $ | 0.71 |  |  | $ | 0.65 |  |  | $ | 1.46 |  |  | $ | 1.68 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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