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Common and Preferred Stock Common and Preferred Stock (Schedule of Activity in the Outstanding Shares of the Company's Common Stock) (Details) - Common Stock [Member] - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Common Stock [Roll Forward]      
Shares outstanding, beginning balance 112,132 111,129 106,615
Awards and sales under employee and director plans 335 329 416
5% stock dividend 5,574 5,359 5,305
Other purchases of treasury stock (887) (4,670) (1,194)
Other (16) (15) (13)
Shares outstanding, ending balance 117,138 112,132 111,129