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UNAUDITED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - $ / shares
Jun. 30, 2015
Dec. 31, 2014
Stockholders' equity    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 350,000,000 350,000,000
Common stock, shares issued (in shares) 216,708,849 216,256,971
Treasury stock at cost (in shares) 68,095,313 67,660,313