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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Per share amounts are computed as follows:
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 20.8 |  |  | $ | 14.0 |  |  | $ | 56.2 |  |  | $ | 49.1 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 24,420 |  |  |  | 23,621 |  |  |  | 24,394 |  |  |  | 23,518 |
Dilutive effect of stock options and awards |  |  | 495 |  |  |  | 475 |  |  |  | 455 |  |  |  | 567 |
Denominator for diluted earnings per share |  |  | 24,915 |  |  |  | 24,096 |  |  |  | 24,849 |  |  |  | 24,085 |
Net income per share, basic: |  | $ | 0.85 |  |  | $ | 0.59 |  |  | $ | 2.30 |  |  | $ | 2.09 |
Net income per share, diluted: |  | $ | 0.83 |  |  | $ | 0.58 |  |  | $ | 2.26 |  |  | $ | 2.04 |

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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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