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Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings per Share [Abstract]  
Reconciliation of basic and diluted net income per share

The following table sets forth the reconciliation of basic and diluted net income per share for the three months ended March 31, 2013 and 2012 (in thousands, except per share data):
 
 
Three Months Ended March 31,
 
 
2013
 
 
2012
 
Numerator
 
 
 
 
 
 
Net income attributable to CAI common stockholders used in the calculation of basic and diluted earnings per share
 
$
16,067
 
 
$
14,391
 
Denominator
 
 
 
 
 
 
 
 
Weighted average shares used in the calculation of basic earnings per share
 
 
22,085
 
 
 
19,295
 
Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options
 
 
583
 
 
 
409
 
Weighted average shares used in the calculation of diluted earnings per share
 
 
22,668
 
 
 
19,704
 
Net income per share attributable to CAI common stockholders:
 
 
 
 
 
 
 
 
Basic
 
$
0.73
 
 
$
0.75
 
Diluted
 
$
0.71
 
 
$
0.73