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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Computation of Earnings Per Share
The computation of earnings per share is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2017
 
June 30,
2016
 
June 30,
2017
 
June 30,
2016
 
(in thousands, except per share data)
Basic earnings per share:
 
 
 
 
 
 
 
Net income
$
65,600

 
$
40,755

 
$
243,822

 
$
68,413

Shares used in computation:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
431,396

 
428,483

 
431,000

 
428,300

Basic earnings per share
$
0.15

 
$
0.10

 
$
0.57

 
$
0.16

 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
Net income
$
65,600

 
$
40,755

 
$
243,822

 
$
68,413

Shares used in computation:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
431,396

 
428,483

 
431,000

 
428,300

Employee stock options
14,866

 
9,671

 
14,862

 
9,773

Weighted-average number of shares
446,262

 
438,154

 
445,862

 
438,073

Diluted earnings per share
$
0.15

 
$
0.09

 
$
0.55

 
$
0.16

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
 
Six months ended
 
June 30,
2017
 
June 30,
2016
 
June 30,
2017
 
June 30,
2016
 
(in thousands)
Employee stock options
215

 
1,930

 
226

 
1,634