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Weighted Average Common Shares | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Weighted Average Common Shares | 11. WEIGHTED AVERAGE COMMON SHARES Basic net income per share is calculated by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing net income by the weighted average number of shares assuming dilution. Dilutive common shares outstanding is computed using the Treasury Stock Method and reflects the additional shares that would be outstanding if dilutive stock options were exercised and restricted stock units were settled for common shares during the period. The weighted average number of common shares used to compute basic and diluted net income per share for the quarters and years to date ended September 30, 2018 and 2017 were as follows:
| For the Quarter Ended September 30, |  |  | For the Year to Date Ended September 30, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Basic common shares outstanding |  | 69,737 |  |  |  | 69,082 |  |  |  | 69,542 |  |  |  | 68,897 |
Common stock equivalents |  | 2,053 |  |  |  | 1,783 |  |  |  | 1,883 |  |  |  | 1,763 |
Diluted common shares outstanding |  | 71,790 |  |  |  | 70,865 |  |  |  | 71,425 |  |  |  | 70,660 |
For the quarters and years to date ended September 30, 2018 and 2017, certain unexercised stock option awards are excluded from our computations of diluted earnings per share, as these shares were out-of-the-money and their effect would have been anti-dilutive. The anti-dilutive options that were excluded from our computations of diluted earnings per share were 0.8 million shares for each of the quarter and year to date ended September 30, 2018 and 1.1 million shares for each of the quarter and year to date ended September 30, 2017.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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