Calculation of Earnings per Share

6 Months Ended

Jun. 30, 2016

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 Inc. by the weighted-

7. Calculation of Earnings per Share, continued

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,
	2016		2015		2016		2015
Net income attributable to VCA Inc.	$	64,050	$	54,299	$	110,277	$	92,600
Weighted-average common shares outstanding:
Basic	80,835		81,956		80,806		82,150
Effect of dilutive potential common shares:
Stock options	295		334		294		337
Non-vested shares and units	599		794		530		740
Diluted	81,729		83,084		81,630		83,227
Basic earnings per common share	$	0.79	$	0.66	$	1.36	$	1.13
Diluted earnings per common share	$	0.78	$	0.65	$	1.35	$	1.11

For the three months ended June 30, 2016, there were 21,122 potential shares excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect. There were no potential common shares excluded from the computation of diluted earnings per share for the three months ended June 30, 2015.

For the six months ended June 30, 2016 and 2015, potential common shares of 24,047 and 38,120, respectively, were excluded from the computation of diluted earnings per share because their inclusion would have had an antidilutive effect.