EARNINGS PER SHARE

12 Months Ended

Dec. 31, 2015

Basic earnings per share ("EPS") is computed by dividing net income attributable to Heska Corporation by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the numerator is increased to exclude charges that would not have been incurred, and the denominator is increased to include the number of additional common shares that would have been outstanding (using the if-converted and treasury stock methods), if securities containing potentially dilutive common shares (stock options and restricted stock units but excluding options to purchase fractional shares resulting from the Company's December 2010 1-for-10 reverse stock split) had been converted to common shares, and if such assumed conversion is dilutive.

The following is a reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted earnings per share for the years ended December 31, 2013, 2014, and 2015 (in thousands, except per share data):



	Years ended December 31,
	2013			2014		2015
Net income (loss) attributable to Heska Corporation	$	(1,196	)	$	2,603	$	5,239

Basic weighted-average common shares outstanding	5,755			5,951		6,509
Assumed exercise of dilutive stock options and restricted stock units	—			458		565
Diluted weighted-average common shares outstanding	5,755			6,409		7,074

Basic earnings (loss) per share	$	(0.21	)	$	0.44	$	0.80
Diluted earnings (loss) per share	$	(0.21	)	$	0.41	$	0.74

The following stock options and restricted units were excluded from the computation of diluted earnings per share because they would have been anti-dilutive (in thousands):



	Years ended December 31,
	2013	2014	2015
Stock options	1,103	367	144