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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stock Options and Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock option and SAR activity
The following table illustrates the stock option and SAR activity for the year ended December 31, 2017:
 
Number
of
Shares
(in 000’s)
 
Weighted-
Average
Exercise
Price
Outstanding at December 31, 2016
1,753

 
$
42.16

 
 
 
 
Granted
848

 
$
42.30

Forfeited
(148
)
 
$
44.49

Exercised
(145
)
 
$
31.12

 
 
 
 
Outstanding at December 31, 2017
2,308

 
$
42.75

Exercisable at December 31, 2017
504

 
$
42.46

Stock options & SARs expected to vest
1,804

 
$
42.83
Valuation Assumptions
The following table illustrates the assumptions used in estimating fair value in the years ended December 31, 2017, 2016 and 2015:
 
2017
 
2016
 
2015
Grant date fair value of stock options and SARs
$
10.07

 
$
8.61

 
$
11.37

Expected stock price volatility
27.63
%
 
26.88
%
 
25.96
%
Risk-free interest rate
2.11
%
 
1.45
%
 
1.49
%
Expected annual dividend yield
1.87
%
 
2.10
%
 
1.55
%
Expected life of options & SARs (years)
5.8

 
6.0

 
5.7
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of RSU and PSU activity
The following table illustrates the RSU and PSU activity for the year ended December 31, 2017:  
 
Number
of
Shares
(in 000’s)
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2016
297

 
$
41.01

 
 
 
 
Granted
29

 
$
48.32

Vested
(84
)
 
$
41.06

Forfeited
(14
)
 
$
44.64

 
 
 
 
Outstanding at December 31, 2017
228

 
$
41.66