Calculation of Earnings per Share

3 Months Ended

Mar. 31, 2014

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 March 31,
	2014		2013
Net income attributable to VCA Antech, Inc.	$	34,043	$	30,485
Weighted-average common shares outstanding:
Basic	88,338		88,400
Effect of dilutive potential common shares:
Stock options	254		284
Nonvested shares and units	829		695
Diluted	89,421		89,379
Basic earnings per share	$	0.39	$	0.34
Diluted earnings per share	$	0.38	$	0.34

There were no potential common shares excluded from the computation of diluted earnings per share for the three months ended March 31, 2014. For the three months ended March 31, 2013, potential common shares of 497,826 were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.