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Share Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Fair Value and Assumptions
The following table shows the weighted average fair value for our stock appreciation rights and the assumptions we used to estimate fair value:
 
2013
 
2012
 
2011
Weighted average estimated fair value
$
18.89

 
$
18.48

 
$
13.88

Quarterly dividend rate
$
0.30

 
$
0.29

 
$
0.29

Expected term of stock appreciation rights, in years
4.7

 
4.7

 
4.3

Risk-free interest rate
0.7
%
 
1.0
%
 
1.6
%
Dividend yield
2.6
%
 
2.7
%
 
3.4
%
Expected stock price volatility
42.4
%
 
43.3
%
 
41.9
%
Present value of dividends
$
5.60

 
$
5.37

 
$
4.76
Data With Respect to Stock Options SARs Activity

The following table shows information about outstanding stock options and stock appreciation rights for the year ended December 31, 2013:


Number of Stock Options and Stock Appreciation Rights (in thousands)
 
Weighted Average Exercise Price
Outstanding at beginning of the year
1,872
 
$
33.82

Granted
317
 
45.91

Exercised
(442)
 
33.23

Forfeited/Cancelled
(36)
 
42.25

Expired
(17)
 
36.31

Outstanding at end of the year
1,694
 
36.03

Vested and exercisable at end of the year
1,052
 
31.79
Schedule of Share-Based Compensation, Aggregate Intrinsic Value and Weighted Average Remaining Contractual Term
The following table shows the aggregate intrinsic value of stock options and stock appreciation rights exercised in 2013, 2012, and 2011, and the weighted average remaining contractual term and aggregate intrinsic value of stock appreciation rights outstanding and vested as of December 31, 2013:
Stock Options and Stock Appreciation Rights
Weighted Average Remaining Contractual Term
(Years)
 
Aggregate Intrinsic Value
(in millions)
Exercised in 2011
 
 
$
4.5

Exercised in 2012
 
 
4.9

Exercised in 2013
 
 
6.9

 
 
 
 
Outstanding at December 31, 2013 (a)
3.6
 
27.9

Vested and exercisable at December 31, 2013
2.6
 
21.8

__________________
(a) As of December 31, 2013, there are no remaining stock options outstanding.
Schedule of Share-Based Compensation, Restricted Stock Units and Performance Shares Award Activity
The following table shows information about restricted stock units and performance shares for the year ended December 31, 2013:


Number of Share Units Outstanding
 
Weighted Average Grant-Date Fair Value
Restricted Stock Units:
 
 
 
Nonvested at beginning of the year
266,990

 
$
35.03

Granted
67,970

 
45.75

Vested
(122,722
)
 
30.27

Forfeited
(12,188
)
 
42.07

Nonvested at end of the year
200,050

 
41.17

Performance Shares:
 
 
 
Nonvested at beginning of the year
189,206

 
$
38.42

Granted
68,780

 
45.01

Net increase due to estimated performance
14,523

 
41.82

Vested
(112,177
)
 
33.74

Nonvested at end of the year
160,332

 
44.48