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Earnings Per Share | 6 Months Ended
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Jun. 30, 2011
Earnings Per Share [Abstract] |
Earnings Per Share |
(3) | Earnings Per Share (“EPS”): The denominator used to compute basic and diluted earnings per share is as follows (in millions):
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Denominator for basic EPS – weighted average shares |  |  | 41.7 |  |  |  | 41.2 |  |  |  | 41.6 |  |  |  | 41.1 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee/director stock options and restricted stock units |  |  | 0.5 |  |  |  | 0.2 |  |  |  | 0.4 |  |  |  | 0.3 |
Denominator for diluted EPS – weighted average shares |  |  | 42.2 |  |  |  | 41.4 |  |  |  | 42.0 |  |  |  | 41.4 |
Basic earnings per share is computed based on the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed based on the weighted-average number of common shares outstanding adjusted by the number of additional shares that would have been outstanding had the potentially dilutive common shares been issued. Potentially dilutive shares of common stock include non-qualified stock options and restricted stock units. The computation of weighted average dilutive shares outstanding excluded non-qualified stock options to purchase approximately 0.2 million and 1.9 million shares of common stock for the three month periods ended June 30, 2011 and 2010, respectively. The computation of weighted average dilutive shares outstanding excluded non-qualified stock options to purchase approximately 1.2 million and 1.9 million shares of common stock for the six months ended June 30, 2011 and 2010, respectively. These options were excluded because the options' exercise prices were greater than the average market price of the Company's common stock for the periods presented and, therefore, the effect would be anti-dilutive.

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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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: 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=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6920599&loc=d3e1278-109256 Reference 5: 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 6: 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=6880815&loc=d3e20235-122688 + Details
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