Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016		June 30, 2015		June 30, 2016		June 30, 2015
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	40,755	$	26,335	$	68,413	$	50,031
Shares used in computation:
Weighted-average common shares outstanding	428,483		425,340		428,300		424,486
Basic earnings per share	$	0.10	$	0.06	$	0.16	$	0.12
Diluted earnings per share:
Net income	$	40,755	$	26,335	$	68,413	$	50,031
Shares used in computation:
Weighted-average common shares outstanding	428,483		425,340		428,300		424,486
Employee stock options	9,671		10,757		9,773		10,472
Weighted-average number of shares	438,154		436,097		438,073		434,958
Diluted earnings per share	$	0.09	$	0.06	$	0.16	$	0.12

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, 2016	June 30, 2015	June 30, 2016	June 30, 2015
	(in thousands)
Employee stock options	1,930	80	1,634	938