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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
A summary of the status of the stock option plans and changes during the year
A summary of the status of the stock option plans at December 31, 2012, and changes during the year then ended was as follows:

 
Number of Shares

Weighted Average Exercise Price

Balance at beginning of year
6,750

$
13.03

Exercised
(6,750
)
13.03

Balance at end of year


Target grants performance share
Target grants of performance shares outstanding at December 31, 2012, were as follows:

Grant Date
Performance Period
Target Grant of Shares

March 2010
2010-2012
213,432

February 2011
2011-2013
261,029

February 2012
2012-2014
311,675

Schedule of share-based payment award, stock options, valuation assumptions
Assumptions used for grants of performance shares issued in 2012, 2011 and 2010 were:

 
 
 
2012

 
 
2011

 
 
2010

Grant-date fair value
 
 

$17.18

 
 

$19.99

 
 

$17.40

Blended volatility range
24.29
%
-
25.81
%
23.20
%
-
32.18
%
25.69
%
-
35.36
%
Risk-free interest rate range
.10
%
-
.35
%
.09
%
-
1.34
%
.13
%
-
1.45
%
Discounted dividends per share
 
 

$1.19

 
 

$1.23

 
 

$1.04

A summary of the status of the performance share awards
A summary of the status of the performance share awards for the year ended December 31, 2012, was as follows:
 
Number of
Shares

Weighted Average Grant-Date Fair Value

Nonvested at beginning of period
762,154

$
19.35

Granted
320,692

17.18

Vested


Forfeited
(296,710
)
20.13

Nonvested at end of period
786,136

$
18.17