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Earnings per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings per Share | Earnings per Share The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average number of shares outstanding used to calculate basic EPS |  | 3,612 |  |  | 3,747 |  |  | 3,640 |  |  | 3,733 |
Dilutive securities: |  |  |  |  |  |  |  |
Stock options and restricted share units |  | 444 |  |  | 516 |  |  | 499 |  |  | 466 |
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS |  | 4,056 |  |  | 4,263 |  |  | 4,139 |  |  | 4,199 |
The following non-qualified stock options ("Options") and restricted share units (RSUs") issued under equity incentive plans were outstanding during the three and nine months ended September 30, 2018 and 2017, but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Anti-dilutive securities |  | 371 |  |  | 8 |  |  | 353 |  |  | 17 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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