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Common and Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2016
Common And Preferred Stock [Abstract]  
Schedule of issued shares
(Shares in thousands)201620152014
Common: Par value $0.25; 600,000 shares authorized   
Outstanding - January 1, 256,544 259,276 275,526
Issued for stock option and other benefit plans 1,110 2,751 2,284
Repurchased common stock (785) (5,483) (18,534)
Outstanding - December 31, 256,869 256,544 259,276
Treasury stock 39,276 39,601 36,869
Issued - December 31, 296,145 296,145 296,145