Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2011

Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income Per Common Share

The following table reconciles the weighted-average shares outstanding for computation of basic and diluted income per Common share for each of the three years ended December 31, 2011. No difference existed between net income used in computing basic and diluted income per Common share for these years.

(Weighted-average shares outstanding)	2011		2010		2009
Basic method		193,409,621		191,830,357		190,767,077
Dilutive stock options		1,102,781		1,327,457		1,701,373
Diluted method		194,512,402		193,157,814		192,468,450