Earnings Per Share

6 Months Ended

Jun. 30, 2016

Basic earnings per share is computed using the weighted-average number of outstanding shares of common stock during the period. Diluted earnings per share is computed using the weighted-average number of outstanding shares of common stock and, when dilutive, potential common shares outstanding during the period. Potential common shares consist of incremental shares issuable upon the assumed exercise of stock options. 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

Employee stock options with exercise prices greater than the average market price of the common stock were excluded from the diluted calculation as their inclusion would have been anti-dilutive. 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