Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Computation of Earnings Per Share

The computation of earnings per share is as follows:

	Year ended December 31,
	2020		2019		2018
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	2,761,395	$	1,866,916	$	1,211,242
Shares used in computation:
Weighted-average common shares outstanding	440,922		437,799		435,374
Basic earnings per share	$	6.26	$	4.26	$	2.78
Diluted earnings per share:
Net income	$	2,761,395	$	1,866,916	$	1,211,242
Shares used in computation:
Weighted-average common shares outstanding	440,922		437,799		435,374
Employee stock options	13,286		13,966		15,870
Weighted-average number of shares	454,208		451,765		451,244
Diluted earnings per share	$	6.08	$	4.13	$	2.68

Summary of Potential Common Shares Excluded from Diluted Calculation

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

	Year ended December 31,
	2020	2019	2018
	(in thousands)
Employee stock options	484	1,588	330