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Earnings Per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | 8. Earnings Per Share Earnings per share is computed in accordance with ASC 260, 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):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 118,059 |  |  |  | 117,533 |  |  |  | 117,465 |
Add: Dilutive effect of stock options |  |  | 1,385 |  |  |  | 1,314 |  |  |  | 1,454 |
Diluted weighted average shares outstanding |  |  | 119,444 |  |  |  | 118,847 |  |  |  | 118,919 |
For the years ended December 31, 2017, 2016, and 2015, respectively, 3.9 million, 6.1 million, and 3.7 million, options to purchase shares and contingently issuable shares, were excluded from the diluted earnings per share computation as their effect would be anti-dilutive. Common stock outstanding as of December 31, 2017 and 2016 was 117,096,731 and 117,336,797, 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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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