Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

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

	Quarter Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Net income for basic and diluted earnings per share	$	466,295	$	369,526	$	684,948	$	584,252
Weighted-average common shares outstanding	211,673		215,085		212,139		214,978
Dilutive effect of stock-based awards and stock options	836		977		940		966
Diluted weighted-average shares outstanding	212,509		216,062		213,079		215,944
Basic earnings per share	$	2.20	$	1.72	$	3.23	$	2.72
Diluted earnings per share	$	2.19	$	1.71	$	3.21	$	2.71

There were no antidilutive shares for thequarters and six months ended June 30, 2018 and 2017.