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Note 5 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
   
(Dollars in thousands, except per share amounts)
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
Net income
   $
210,780
     $
141,835
     $
103,211
  
Less: distributed earnings allocated to participating securities
    
(413
 )    
(257
 )    
(163
 )
Less: undistributed earnings allocated to participating securities
    
(846
 )    
(441
 )    
(179
 )
Net income attributable to common stockholders (numerator for basic earnings per share)
    
209,521
      
141,137
      
102,869
  
Add back: undistributed earnings allocated to participating securities
    
846
      
441
      
179
  
Less: undistributed earnings reallocated to participating securities
    
(833
 )    
(431
 )    
(179
 )
Numerator for diluted earnings per share under two class method
   $
209,534
     $
141,147
     $
102,869
  
                         
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
Weighted-average common shares outstanding
    
56,084,373
      
55,663,908
      
55,389,898
  
Add: dilutive effect of stock options
    
911,181
      
1,237,553
      
173,022
  
Add: dilutive effect of performance stock units
    
255,150
      
-
      
-
  
Denominator for diluted earnings per share under two class method
    
57,250,704
      
56,901,461
      
55,562,920
  
                         
Basic Earnings Per Common Share
   $
3.74
     $
2.54
     $
1.86
  
Diluted Earnings Per Common Share
   $
3.66
     $
2.48
     $
1.85