Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017		September 30, 2016		September 30, 2017		September 30, 2016
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	129,590	$	51,517	$	373,412	$	119,930
Shares used in computation:
Weighted-average common shares outstanding	432,404		428,937		431,473		428,514
Basic earnings per share	$	0.30	$	0.12	$	0.87	$	0.28
Diluted earnings per share:
Net income	$	129,590	$	51,517	$	373,412	$	119,930
Shares used in computation:
Weighted-average common shares outstanding	432,404		428,937		431,473		428,514
Employee stock options	14,958		9,452		14,894		9,666
Weighted-average number of shares	447,362		438,389		446,367		438,180
Diluted earnings per share	$	0.29	$	0.12	$	0.84	$	0.27

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, 2017	September 30, 2016	September 30, 2017	September 30, 2016
	(in thousands)
Employee stock options	187	2,559	213	1,942