Common Stock Issued and Outstanding (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity and Common Stock Issued and Outstanding [Abstract]

Activity in Number of Shares of Common Stock Issued and Outstanding

(Number of shares outstanding)	2018	2017	2016
Beginning of year	172,572,873	172,202,177	172,034,711
Stock options exercised  1	21,200	–	–
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.