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Calculation of Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2017
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,
 
2017
 
2016
Net income attributable to VCA Inc.
$
51,093

 
$
46,227

Weighted-average common shares outstanding:
 
 
 
Basic
81,245

 
80,776

Effect of dilutive potential common shares:
 
 
 
Stock options
360

 
284

Non-vested shares and units
574

 
463

Diluted
82,179

 
81,523

Basic earnings per common share
$
0.63

 
$
0.57

Diluted earnings per common share
$
0.62

 
$
0.57