8.EARNINGS PER SHARE

The calculation of basic earnings per share considers only weighted average outstanding common shares in the computation. The calculation of diluted earnings per share gives effect to all potentially dilutive stock options. The calculation of diluted earnings per share is based upon the weighted average number of common shares outstanding during the period, plus, if dilutive, the assumed exercise of stock options using the treasury stock method. Weighted average shares outstanding for the three and six months ended June 30, 2019 and 2018 were as follows:



	For the three months				For the six months
	ended June 30,				ended June 30,
Amounts in thousands	2019		2018		2019		2018
Weighted average common shares, basic		29,440		29,376		29,440		29,369
Dilutive effect of stock options		—		598		674		615
Weighted average common shares, diluted		29,440		29,974		30,114		29,984

There were 744,032 stock options and non-vested (restricted) shares for the three months ended June 30, 2019 excluded from the calculation of diluted shares as they were antidilutive.

The following stock options are anti-dilutive and have not been included in the weighted average shares outstanding calculation:



	For the three months				For the six months
	ended June 30,				ended June 30,
Amounts in thousands	2019		2018		2019		2018
Stock options		1,686		79		115		40