Calculation of Earnings per Share

3 Months Ended

Mar. 31, 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):

8.    Calculation of Earnings per Share, continued

	Three Months Ended March 31,
	2013		2012
Net income attributable to VCA Antech, Inc	$	30,485	$	35,245
Weighted-average common shares outstanding:
Basic	88,400		86,984
Effect of dilutive potential common shares:
Stock options	284		560
Nonvested shares and units	695		511
Diluted	89,379		88,055
Basic earnings per share	$	0.34	$	0.41
Diluted earnings per share	$	0.34	$	0.40

For the three months ended March 31, 2013 and 2012, potential common shares of 497,826 and 1,067,063, respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.