Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018		June 30, 2017		June 30, 2018		June 30, 2017
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	384,349	$	65,600	$	674,473	$	243,822
Shares used in computation:
Weighted-average common shares outstanding	435,097		431,396		434,638		431,000
Basic earnings per share	$	0.88	$	0.15	$	1.55	$	0.57
Diluted earnings per share:
Net income	$	384,349	$	65,600	$	674,473	$	243,822
Shares used in computation:
Weighted-average common shares outstanding	435,097		431,396		434,638		431,000
Employee stock options	16,455		14,866		16,320		14,862
Weighted-average number of shares	451,552		446,262		450,958		445,862
Diluted earnings per share	$	0.85	$	0.15	$	1.50	$	0.55