Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017		2016		2017		2016
Net income for basic and diluted earnings per share	$	752,842	$	693,257	$	1,337,094	$	1,022,302
Weighted-average common shares outstanding	214,694		214,819		214,882		215,663
Dilutive effect of stock options, performance share awards and restricted stock awards	1,130		848		1,023		912
Diluted weighted-average shares outstanding	215,824		215,667		215,905		216,575
Basic earnings per share	$	3.51	$	3.23	$	6.22	$	4.74
Diluted earnings per share	$	3.49	$	3.21	$	6.19	$	4.72