Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

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,
	2011		2010		2009
Net income for basic and diluted earnings per share	$	607,421	$	515,653	$	152,485
Weighted-average common shares outstanding		216,983		215,026		213,809
Dilutive effect of stock options and restricted stock awards		2,246		2,685		1,486
Diluted weighted-average shares outstanding		219,229		217,711		215,295
Basic earnings per share:
Net income	$	2.80	$	2.40	$	0.71
Diluted earnings per share:
Net income	$	2.77	$	2.37	$	0.71