Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2016

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,
	2016		2015		2016		2015
Net income for basic and diluted earnings per share	$	693,257	$	228,787	$	1,022,302	$	458,984
Weighted-average common shares outstanding	214,819		219,963		215,663		219,835
Dilutive effect of stock options, performance share awards and restricted stock awards	848		1,174		912		1,144
Diluted weighted-average shares outstanding	215,667		221,137		216,575		220,979
Basic earnings per share	$	3.23	$	1.04	$	4.74	$	2.09
Diluted earnings per share	$	3.21	$	1.03	$	4.72	$	2.08