Horrocks Company granted 180,000 restricted stock awards of its no par common shares to executives, subject to forfeiture if employment is terminated within three years. Horrocks' common shares have a market price of $10 per share on January 1, 2010, the grant date, and at December 31, 2011, averaging $10 throughout the year. When calculating diluted EPS at December 31, 2011, what will be the net increase in the denominator of the EPS fraction ?