Common Stock Issued and Outstanding (Activity in the Number of Common Stock Issued and Outstanding) (Details) - shares		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity and Common Stock Issued and Outstanding [Abstract]
Beginning of year		172,572,873		172,202,177	172,034,711
Stock options exercised		21,200	[1]	0	0
Restricted stock awards	[1]	464,756		368,132	158,504
Employee stock purchase and thrift plans				2,564	8,962
Treasury shares purchased
End of year		173,058,829		172,572,873	172,202,177

[1] Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note K due to withholdings for statutory income taxes owed upon issuance of shares.