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Earnings Per Share | 9 Months Ended
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Sep. 30, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | 9. Earnings Per Share Basic earnings per share is computed on the basis of weighted average outstanding common shares. Diluted earnings per share is computed on the basis of basic weighted average outstanding common shares adjusted for the dilutive effect of stock options and other outstanding dilutive securities. The following table reconciles the average share amounts used to compute both basic and diluted earnings per share (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 117,922 |  |  |  | 114,484 |  |  |  | 117,035 |  |  |  | 114,603 |
Add: Dilutive effect of stock options |  |  | 1,382 |  |  |  | 1,944 |  |  |  | 1,463 |  |  |  | 2,079 |
Diluted weighted average shares outstanding |  |  | 119,304 |  |  |  | 116,428 |  |  |  | 118,498 |  |  |  | 116,682 |
The diluted earnings per share computation excludes 3.6 million and 4.0 million options to purchase shares and contingently issuable shares during the three and nine months ended September 30, 2015, respectively, as their effect would be anti-dilutive. The diluted earnings per share computation excludes 3.1 million and 3.2 million options to purchase shares, restricted share awards, and contingently issuable shares during the three and nine months ended September 30, 2014, as their effect would be anti-dilutive. Common stock outstanding as of September 30, 2015 and December 31, 2014 was 118,258,853 and 115,637,804, respectively.

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