Common Stock Issued and Outstanding (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders; Equity, Common Stock Issued and Outstanding [Abstract]

Activity in Number of Shares of Common Stock Issued and Outstanding

(Number of shares outstanding)	2016	2015	2014
At beginning of year	172,034,711	177,499,513	183,406,513
Stock options exercised*	-	15,575	119,994
Restricted stock awards*	158,504	478,549	339,985
Employee stock purchase and thrift plans	8,962	8,387	6,739
Treasury shares purchased	-	(5,967,313)	(6,373,718)
At end of year	172,202,177	172,034,711	177,499,513

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