Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2015

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,
	2015		2014		2015		2014
Net income for basic and diluted earnings per share	$	228,787	$	490,248	$	458,984	$	654,378
Weighted-average common shares outstanding	219,963		222,523		219,835		222,007
Dilutive effect of stock options, performance share awards and restricted stock awards	1,174		1,336		1,144		1,344
Diluted weighted-average shares outstanding	221,137		223,859		220,979		223,351
Basic earnings per share	$	1.04	$	2.20	$	2.09	$	2.95
Diluted earnings per share	$	1.03	$	2.19	$	2.08	$	2.93