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Earnings per Share (Tables)
3 Months Ended
Mar. 31, 2016
Earnings per Share [Abstract]  
Computation of earnings per share
The following table sets forth the computation of net income attributable to controlling interest and the number of basic and diluted shares used in the computation of earnings per share:

  
Three Months Ended
March 31,
 
  
2016
  
2015
 
Numerator:
      
Net income attributable to controlling interest
 
$
17,743
  
$
15,105
 
Denominator:
        
Denominator for basic earnings per share
  
22,965
   
22,904
 
Effect of dilutive securities:
        
Employee stock options and restricted stock units
  
106
   
145
 
Supplemental Executive Retirement Plan
  
64
   
65
 
Denominator for diluted earnings per share
  
23,135
   
23,114