Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share

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,
	2012		2011		2010
Net income for basic and diluted earnings per share	$	18,287	$	607,421	$	515,653
Weighted-average common shares outstanding		217,930		216,983		215,026
Dilutive effect of stock options, performance stock awards and restricted stock awards		1,527		2,246		2,685
Diluted weighted-average shares outstanding		219,457		219,229		217,711
Basic earnings per share:
Net income	$	0.08	$	2.80	$	2.40
Diluted earnings per share:
Net income	$	0.08	$	2.77	$	2.37