Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Reconciliation Between Basic and Diluted Earnings Per Share

A reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share data):

	Quarter Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Net income for basic and diluted earnings per share	$	810,391	$	752,842	$	1,495,339	$	1,337,094
Weighted-average common shares outstanding	209,054		214,694		211,099		214,882
Dilutive effect of stock-based awards and stock options	874		1,130		874		1,023
Diluted weighted-average shares outstanding	209,928		215,824		211,973		215,905
Basic earnings per share	$	3.88	$	3.51	$	7.08	$	6.22
Diluted earnings per share	$	3.86	$	3.49	$	7.05	$	6.19