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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Assumptions Used To Value Share-Based Compensation
The assumptions used in the Black-Scholes single option pricing model are as follows.
 
Year Ended December 31
 
2018
 
2017
 
2016
Dividend yield
3%
 
3%
 
3%
Risk-free interest rate
2%
 
2%
 
1%
Stock volatility
23%
 
25%
 
25%
Average expected life (years)
6
 
6
 
6
Summary Of Option Activity During The Period
A summary of option activity during 2018 is presented below:
 
Shares
 
Weighted-Average
Exercise Price
 
(In thousands, except per share amounts)
Shares under option at December 31, 2017
11,026

 
$33.23
Granted(1)
—

 
40.50

Exercised
(1,954
)
 
28.15
Forfeited or expired
(11
)
 
27.06
Shares under option at December 31, 2018
9,061

 
$34.33
 
 
 
 
Exercisable at December 31, 2018
6,736

 
$33.07
Summary Of Restricted Stock Awards And PSUs Activity During The Period
A summary of Restricted Stock Awards and PSUs activity during 2018 is presented below:
 
Restricted
Stock Awards and PSUs
 
Weighted Average
Grant-Date Fair Value
 
(In thousands, except per share amounts)
Non-vested at December 31, 2017
5,367

 
$41.60
Granted
2,518

 
42.72
Vested
(1,575
)
 
46.69
Forfeited
(185
)
 
40.42
Non-vested at December 31, 2018
6,125

 
$40.82