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Earnings Per Share | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Earnings Per Share | NOTE 3—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:
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30 |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator (in millions): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 17.1 |  |  | $ | 15.5 |  |  | $ | 35.1 |  |  | $ | 40.1 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 23,528 |  |  |  | 23,147 |  |  |  | 23,466 |  |  |  | 23,101 |
Dilutive effect of stock options and awards |  |  | 529 |  |  |  | 747 |  |  |  | 607 |  |  |  | 719 |
Denominator for diluted earnings per share |  |  | 24,057 |  |  |  | 23,894 |  |  |  | 24,073 |  |  |  | 23,820 |
Net income per share, basic: |  | $ | 0.73 |  |  | $ | 0.67 |  |  | $ | 1.50 |  |  | $ | 1.74 |
Net income per share, diluted: |  | $ | 0.71 |  |  | $ | 0.65 |  |  | $ | 1.46 |  |  | $ | 1.68 |
In the three and six months ended June 30, 2013, the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were nil and 10,527, respectively. In the three and six months ended June 30, 2012, the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 32,392 and 1,380, respectively.

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- Definition The entire disclosure for earnings per share. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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