Calculation of Earnings per Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Calculation of Earnings per Share

sic 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 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,
	2015		2014
Net income attributable to VCA Inc.	$	38,301	$	34,043
Weighted-average common shares outstanding:
Basic	82,347		88,338
Effect of dilutive potential common shares:
Stock options	340		254
Non-vested shares and units	686		829
Diluted	83,373		89,421
Basic earnings per common share	$	0.47	$	0.39
Diluted earnings per common share	$	0.46	$	0.38

For the three months ended March 31, 2015, there was an immaterial amount of potential common shares excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect. For the three months ended March 31, 2014, there were no potential common shares excluded from the computation of diluted earnings per share.