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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Computations of Basic and Diluted Net Income per Share
Basic earnings per share is calculated by dividing net income by the weighted average shares outstanding. Diluted earnings per share is calculated using the treasury stock method by dividing net income by the total weighted average shares of common stock outstanding and restricted stock awards.  The computations of basic and diluted net income per share were as follows (in thousands, except per share amounts):

  
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2020
    
2019
    
2020
    
2019
  
Basic:
                        
Net income
  
$
11,290
    
$
24,017
    
$
22,535
    
$
43,909
  
Weighted average shares outstanding
    
26,629
      
27,357
      
26,658
      
27,929
  
Basic net income per share
  
$
0.42
    
$
0.88
    
$
0.85
    
$
1.57
  
                                 
Diluted:
                                
Net income
  
$
11,290
    
$
24,017
    
$
22,535
    
$
43,909
  
                                 
Weighted average shares outstanding
    
26,629
      
27,357
      
26,658
      
27,929
  
Restricted stock awards
    
27
      
56
      
55
      
44
  
Total
    
26,656
      
27,413
      
26,713
      
27,973
  
                                 
Diluted net income per share
  
$
0.42
    
$
0.88
    
$
0.84
    
$
1.57