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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | Basic and diluted earnings per share were calculated as follows, for each period presented:
| Quarter Ended
| March 31,
| 2013 |  | 2012
Numerator: |  |  |
Net income | $ | 33.5 |  |  | $ | 26.5 |
Denominator — Weighted-average common shares outstanding (in thousands)1: |  |  |
Basic | 19,143 |  |  | 19,059 |
Diluted | 19,366 |  |  | 19,161 |
Earnings per common share, Basic: |  |  |
Net income per share | $ | 1.75 |  |  | $ | 1.39 |
Earnings per common share, Diluted: |  |  |
Net income per share | $ | 1.73 |  |  | $ | 1.38 |
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1 | The basic weighted-average number of common shares outstanding during the period excludes unvested share-based payment awards. The diluted weighted-average number of common shares outstanding during the period is calculated using the treasury method.

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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