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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Summary of Earnings per share |
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) available to common stockholders |  | $ | 15.5 |  |  | $ | (16.8 | ) |  | $ | 55.6 |  |  | $ | 29.3 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 23,240 |  |  |  | 23,711 |  |  |  | 23,148 |  |  |  | 23,698 |
Dilutive effect of stock options and awards |  |  | 683 |  |  |  | 0 |  |  |  | 724 |  |  |  | 918 |
Denominator for diluted earnings per share |  |  | 23,923 |  |  |  | 23,711 |  |  |  | 23,872 |  |  |  | 24,616 |
Net income/(loss) per share, basic |  | $ | 0.67 |  |  | $ | (0.71 | ) |  | $ | 2.40 |  |  | $ | 1.24 |
Net income/(loss) per share, diluted |  | $ | 0.65 |  |  | $ | (0.71 | ) |  | $ | 2.33 |  |  | $ | 1.19 |

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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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