Calculation of Earnings per Share

6 Months Ended

Jun. 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):

8.    Calculation of Earnings per Share, continued

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Net income attributable to VCA Antech, Inc	$	41,662	$	34,320	$	72,147	$	69,565
Weighted-average common shares outstanding:
Basic	88,509		87,589		88,455		87,443
Effect of dilutive potential common shares:
Stock options	321		550		298		555
Nonvested shares and units	823		584		778		557
Diluted	89,653		88,723		89,531		88,555
Basic earnings per share	$	0.47	$	0.39	$	0.82	$	0.80
Diluted earnings per share	$	0.46	$	0.39	$	0.81	$	0.79

For the three months ended June 30, 2013 and 2012, potential common shares of 12,909 and 1,047,701, 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, 2013 and 2012, potential common shares of 26,987 and 1,050,520 respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.