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Net Income Per Share (Tables)
9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Income Per Share
The following table sets forth the computation of basic and diluted net income per share:
 
Three Months Ended
 
September 30,
   
Nine Months Ended
 
September 30,
 
 
2019
   
2018
   
2019
   
2018
 
Numerator:
   
     
     
     
 
Net income
  $
47,428
    $
93,277
    $
       97,622
    $
321,260
 
                                 
Denominator:
   
     
     
     
 
Shares used in net income per common share – basic
   
54,945,000
     
54,476,000
     
54,636,000
     
54,539,000
 
Effect of dilutive securities:
   
     
     
     
 
Restricted stock units, stock appreciation rights and
shares issued under employee stock purchase plan
   
259,000
     
478,000
     
409,000
     
632,000
 
                                 
Shares used in net income per common share – diluted
   
55,204,000
     
54,954,000
     
55,045,000
     
55,171,000
 
                                 
Net income per common share:
   
     
     
     
 
Basic
 
$
0.86
    $
1.71
   
$
 
1.79
    $
5.89
 
Diluted
 
$
 
0.86
    $
1.70
   
$
 
1.77
    $
5.82