Calculation of Earnings per Share

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Calculation of Earnings per Share

Calculation of Earnings per Share

Basic earnings per share is calculated by dividing net income by the weighted-average number of shares outstanding during the period. Diluted earnings per share is calculated by dividing net income attributable to VCA Antech, Inc. by the weighted-average number of common shares outstanding, after giving effect to all dilutive potential common shares outstanding during the period. Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Net income attributable to VCA Antech, Inc	$	34,037	$	30,169	$	103,602	$	98,620
Weighted-average common shares outstanding:
Basic	87,773		86,697		87,554		86,531
Effect of dilutive potential common shares:
Stock options	461		445		523		593
Nonvested shares and units	420		111		512		169
Diluted	88,654		87,253		88,589		87,293
Basic earnings per share	$	0.39	$	0.35	$	1.18	$	1.14
Diluted earnings per share	$	0.38	$	0.35	$	1.17	$	1.13

For the three months ended September 30, 2012 and 2011, potential common shares of 1,220,547 and 2,104,547, respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.

For the nine months ended September 30, 2012 and 2011, potential common shares of 1,100,645 and 1,139,567, respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.