Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2019

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, 2019		September 30, 2018		September 30, 2019		September 30, 2018
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	665,244	$	402,835	$	1,279,946	$	1,077,308
Shares used in computation:
Weighted-average common shares outstanding	438,090		435,809		437,547		435,033
Basic earnings per share	$	1.52	$	0.92	$	2.93	$	2.48
Diluted earnings per share:
Net income	$	665,244	$	402,835	$	1,279,946	$	1,077,308
Shares used in computation:
Weighted-average common shares outstanding	438,090		435,809		437,547		435,033
Employee stock options	13,462		16,110		14,349		16,250
Weighted-average number of shares	451,552		451,919		451,896		451,283
Diluted earnings per share	$	1.47	$	0.89	$	2.83	$	2.39

Summary of Potential Common Shares Excluded from the Diluted Calculation

The following table summarizes the potential common shares excluded from the diluted calculation:

	Three Months Ended		Nine Months Ended
	September 30, 2019	September 30, 2018	September 30, 2019	September 30, 2018
	(in thousands)
Employee stock options	2,402	176	1,268	96