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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
Jun. 30, 2012
Dec. 31, 2011
CONDENSED CONSOLIDATED BALANCE SHEETS    
Common stock, shares issued 99,279,410 98,702,606
Common stock, shares outstanding 50,703,300 51,073,419
Common stock in treasury, shares 48,576,110 47,629,187