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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Computation of Basic EPS to Dilutive EPS The following table reconciles the computation of basic EPS to dilutive EPS:
                         
 
Net
Earnings
(in thousands)
   
Weighted
Average
Shares
   
Per Share
Amount
 
For the three-months ended March 31, 2020:
   
     
     
 
Net earnings per share, basic
  $
 37,232
     
142,118,864
    $
 0.26
 
Effect of stock options and stock grants
   
—  
      
616,344
      
—  
  
                         
Net earnings per share, assuming dilution
  $
 37,232
     
142,735,208
    $
 0.26
 
                         
For the three-ended March 31, 2019:
   
     
     
 
Net earnings per share, basic
  $
 38,252
     
135,494,254
    $
 0.28
 
Effect of stock options and stock grants
   
—  
      
792,608
      
—  
  
                         
Net earnings per share, assuming dilution
  $
 38,252
     
136,286,862
    $
 0.28