Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

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):

	Year Ended December 31,
	2013		2012		2011
Net income for basic and diluted earnings per share	$	473,692	$	18,287	$	607,421
Weighted-average common shares outstanding	219,638		217,930		216,983
Dilutive effect of stock options, performance share awards and restricted stock awards	1,303		1,527		2,246
Diluted weighted-average shares outstanding	220,941		219,457		219,229
Basic earnings per share:
Net income	$	2.16	$	0.08	$	2.80
Diluted earnings per share:
Net income	$	2.14	$	0.08	$	2.77