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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Calculations for Basic and Diluted Earnings Loss Per Share
Presented below are the calculations for basic and diluted earnings per share:

  
Three months ended June 30,
    
Six months ended June 30,
  
   
2020
    
2019
    
2020
    
2019
  
   
(In Thousands, except per share amounts)
  
                         
Net income
  
$
20,948
    
$
9,643
    
$
27,017
    
$
16,185
  
                                 
Weighted average shares outstanding
    
24,464
      
26,242
      
24,934
      
26,370
  
Effect of dilutive potential common shares
    
49
      
170
      
137
      
202
  
Diluted weighted average shares outstanding
    
24,513
      
26,412
      
25,071
      
26,572
  
                                 
Basic earnings per share
  
$
0.86
    
$
0.37
    
$
1.08
    
$
0.61
  
Diluted earnings per share
  
$
0.85
    
$
0.37
    
$
1.08
    
$
0.61