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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Computation of Earnings Per Share
The computation of earnings per share is as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2016
 
September 30,
2015
 
September 30,
2016
 
September 30,
2015
 
(in thousands, except per share data)
Basic earnings per share:
 
 
 
 
 
 
 
Net income
$
51,517

 
$
29,432

 
$
119,930

 
$
79,463

Shares used in computation:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
428,937

 
426,869

 
428,514

 
425,289

Basic earnings per share
$
0.12

 
$
0.07

 
$
0.28

 
$
0.19

 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
Net income
$
51,517

 
$
29,432

 
$
119,930

 
$
79,463

Shares used in computation:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
428,937

 
426,869

 
428,514

 
425,289

Employee stock options
9,452

 
10,737

 
9,666

 
10,560

Weighted-average number of shares
438,389

 
437,606

 
438,180

 
435,849

Diluted earnings per share
$
0.12

 
$
0.07

 
$
0.27

 
$
0.18

Summary of Potential Common Shares Excluded from Diluted Calculation
The following table summarizes the potential common shares excluded from the diluted calculation:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2016
 
September 30,
2015
 
September 30,
2016
 
September 30,
2015
 
(in thousands)
Employee stock options
2,559

 
130

 
1,942

 
668