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Note 4 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2019
    
2018
  
   
(Dollars in thousands, except per
  
 
  
share amounts)
  
Numerator
      
Net income
   $
40,550
     $
38,764
  
Less: distributed earnings allocated to participating securities
    
(111
 )    
(105
 )
Less: undistributed earnings allocated to participating securities
    
(139
 )    
(124
 )
Net income attributable to common stockholders (numerator for basic earnings per share)
    
40,300
      
38,535
  
Add back: undistributed earnings allocated to participating securities
    
139
      
124
  
Less: undistributed earnings reallocated to participating securities
    
(136
 )    
(122
 )
Numerator for diluted earnings per share under two class method
   $
40,303
     $
38,537
  
                 
Denominator
  
 
 
 
  
 
 
 
Weighted-average common shares outstanding
    
60,939,364
      
60,340,774
  
Add: dilutive effect of stock options
    
1,217,846
      
1,106,789
  
Add: dilutive effect of performance stock units
    
551,124
      
-
  
Denominator for diluted earnings per share under two class method
    
62,708,334
      
61,447,563
  
                 
Basic Earnings Per Common Share
   $
0.66
     $
0.64
  
Diluted Earnings Per Common Share
   $
0.64
     $
0.63