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Earnings Per Share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Diluted weighted average shares is calculated as basic weighted average shares plus the effect, calculated using the treasury stock method, of assuming that restricted share units, performance share units and purchase match units have vested. The following table provides the weighted average number of common shares outstanding used in the calculation of the Company's basic and diluted earnings per share:
(In thousands, except per share data) | Three Months Ended June 30 |  | Six Months Ended June 30
2018 |  | 2017 |  | 2018 |  | 2017
Weighted average number of common shares outstanding, basic | 53,610 |  |  | 53,402 |  |  | 53,567 |  |  | 53,359 |
Dilutive effect of securities: |  |  |  |  |  |  |
Restricted Share Units | 69 |  |  | 77 |  |  | 75 |  |  | 77 |
Performance Share Units | 42 |  |  | 105 |  |  | 54 |  |  | 113 |
Purchase Match Units | 20 |  |  | 23 |  |  | 20 |  |  | 22 |
Weighted average number of common shares outstanding, diluted | 53,741 |  |  | 53,607 |  |  | 53,716 |  |  | 53,571 |
Effect of dilutive shares on earnings per share | $ | — |  |  | $ | (0.01 | ) |  | $ | — |  |  | $ | — |
All dilutive common share equivalents are reflected in the earnings per share calculation while antidilutive common share equivalents are not reflected in the earnings per share calculation. The diluted weighted average number of common shares outstanding for the three and six months ended June 30, 2018 excludes approximately 8,000 common share equivalents issuable under the Company's stock compensation plans, as their effect would be antidilutive. There were no common share equivalents that were antidilutive for the three and six months ended June 30, 2017.

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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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