Calculation of Earnings per Share

9 Months Ended

Sep. 30, 2013

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,
	2013		2012		2013		2012
Net income attributable to VCA Antech, Inc	$	40,647	$	34,037	$	112,794	$	103,602
Weighted-average common shares outstanding:
Basic	88,834		87,773		88,583		87,554
Effect of dilutive potential common shares:
Stock options	310		461		318		523
Nonvested shares and units	701		420		758		512
Diluted	89,845		88,654		89,659		88,589
Basic earnings per share	$	0.46	$	0.39	$	1.27	$	1.18
Diluted earnings per share	$	0.45	$	0.38	$	1.26	$	1.17

There were no potential common shares that were excluded from the computation of diluted earnings per share for the three months ended September 30, 2013. For the three months ended September 30, 2012, potential common shares of 1,220,547 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, 2013 and 2012, potential common shares of 23,538 and 1,100,645 respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.