Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019		June 30, 2018		June 30, 2019		June 30, 2018
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	270,650	$	384,349	$	614,702	$	674,473
Shares used in computation:
Weighted-average common shares outstanding	437,587		435,097		437,271		434,638
Basic earnings per share	$	0.62	$	0.88	$	1.41	$	1.55
Diluted earnings per share:
Net income	$	270,650	$	384,349	$	614,702	$	674,473
Shares used in computation:
Weighted-average common shares outstanding	437,587		435,097		437,271		434,638
Employee stock options	14,608		16,455		14,792		16,320
Weighted-average number of shares	452,195		451,552		452,063		450,958
Diluted earnings per share	$	0.60	$	0.85	$	1.36	$	1.50