Calculation of Earnings per Share

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Net income attributable to VCA Antech, Inc	$	34,320	$	39,612	$	69,565	$	68,451
Weighted-average common shares outstanding:
Basic	87,589		86,535		87,443		86,445
Effect of dilutive potential common shares:
Stock options	550		647		555		664
Nonvested shares	584		122		557		194
Diluted	88,723		87,304		88,555		87,303
Basic earnings per share	$	0.39	$	0.46	$	0.80	$	0.79
Diluted earnings per share	$	0.39	$	0.45	$	0.79	$	0.78

For the three months ended June 30, 2012 and 2011, potential common shares of 1,047,701 and 1,139,567, respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.

For the six months ended June 30, 2012 and 2011, potential common shares of 1,050,520 and 40,067, respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.