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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
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 |  | Nine Months Ended
| September 30, |  | September 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
Numerator: |  |  |  |  |  |  |
Net income | $ | 29.2 |  |  | $ | 4.1 |  |  | $ | 76.7 |  |  | $ | 19.0 |
Denominator — Weighted-average common shares outstanding (in thousands)1: |  |  |  |  |  |  |
Basic | 19,154 |  |  | 18,999 |  |  | 19,104 |  |  | 18,971 |
Diluted | 19,288 |  |  | 19,197 |  |  | 19,240 |  |  | 19,171 |
Earnings per common share, Basic: |  |  |  |  |  |  |
Net income per share | $ | 1.52 |  |  | $ | 0.21 |  |  | $ | 4.01 |  |  | $ | 1.00 |
Earnings per common share, Diluted: |  |  |  |  |  |  |
Net income per share | $ | 1.51 |  |  | $ | 0.21 |  |  | $ | 3.98 |  |  | $ | 0.99 |
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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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