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Common and Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2017
Common And Preferred Stock [Abstract]  
Schedule of issued shares
(Shares in thousands)201720162015
Common: Par value $0.25; 600,000 shares authorized
Outstanding - January 1,256,869256,544259,276
Issued for stock option exercises and other benefit plans2,7611,1102,751
Repurchased common stock(15,663)(785)(5,483)
Outstanding - December 31,243,967256,869256,544
Treasury stock52,17839,27639,601
Issued - December 31,296,145296,145296,145