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Earnings Per Share | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | Note 5. Earnings Per Share Basic earnings per share is based on the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period. Per share amounts are computed as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 81.3 |  |  | $ | 119.5 |  |  | $ | 84.1 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 23,998 |  |  |  | 24,107 |  |  |  | 24,391 |
Dilutive effect of stock options and awards |  |  | 444 |  |  |  | 505 |  |  |  | 487 |
Denominator for diluted earnings per share |  |  | 24,442 |  |  |  | 24,612 |  |  |  | 24,878 |
Net income per share, basic: |  | $ | 3.39 |  |  | $ | 4.96 |  |  | $ | 3.45 |
Net income per share, diluted: |  | $ | 3.33 |  |  | $ | 4.86 |  |  | $ | 3.38 |
In 2016, 2015 and 2014 the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 0, 0 and 36,775 respectively.

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