Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Reconciliation Of Earnings Per Share Basic And Diluted

	2011		2010		2009
Numerator:
Income from continuing operations used in computing basic and diluted earnings per share	$	548,078	$	259,669	$	70,641
Denominator:
Denominator for basic earnings per share-weighted-average common shares		232,889		233,312		232,577
Effect of dilutive securities – employee stock compensation plan		2,029		1,475		996
Denominator for diluted earnings per share- adjusted weighted-average shares outstanding		234,918		234,787		233,573
Earnings per common share from continuing operations:
Basic	$	2.35	$	1.11	$	0.30
Diluted	$	2.33	$	1.11	$	0.30