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Calculation of Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings per Share
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