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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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
 
2017
 
2016
 
2015
Dividend yield
3%
 
3%
 
2%
Risk-free interest rate
2%
 
1%
 
2%
Stock volatility
25%
 
25%
 
28%
Average expected life (years)
6
 
6
 
6
Summary Of Option Activity During The Period
A summary of option activity during 2017 is presented below:
 
Shares
 
Weighted-Average
Exercise Price
 
(In thousands, except per share amounts)
Shares under option at December 31, 2016
11,923

 
$33.03
Granted(1)
—

 
—

Exercised
(880
)
 
30.61
Forfeited or expired
(17
)
 
28.33
Shares under option at December 31, 2017
11,026

 
$33.23
 
 
 
 
Exercisable at December 31, 2017
7,532

 
$30.93
Summary Of Restricted Stock Awards And PSUs Activity During The Period
A summary of Restricted Stock Awards and PSUs activity during 2017 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, 2016
4,653

 
$40.03
Granted
2,176

 
44.38
Vested
(1,253
)
 
40.74
Forfeited
(209
)
 
40.89
Non-vested at December 31, 2017
5,367

 
$41.60