Earnings Per Share

12 Months Ended

Dec. 31, 2019

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)	Year Ended December 31
(In thousands, except per share data)	2019		2018		2017
Weighted average number of common shares outstanding, basic	53,740		53,598		53,393
Dilutive effect of securities:
Restricted Share Units	75		70		85
Performance Share Units	10		63		110
Purchase Match Units	16		18		23
Weighted average number of common shares outstanding, diluted	53,841		53,749		53,611
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. There were no antidilutive common share equivalents for the year ended December 31, 2019. The diluted weighted average number of common shares outstanding for the years ended December 31, 2018 and 2017 exclude approximately 2,000 and 7,000 common share equivalents issuable under the Company's stock compensation plans, respectively, as their effect would be antidilutive.