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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Assumption used for the grants
The following table illustrates the valuation assumptions used for the 2012, 2011 and 2010 grants:
 
2012
 
2011
 
2010
Expected volatility
51 - 52%

 
49 - 50%

 
46 - 68%

Weighted-average expected volatility
52
%
 
49
%
 
46
%
Expected dividend yield
1.6 - 1.7%

 
1.7 - 1.8%

 
1.9 - 2.5%

Weighted-average expected dividend yield
1.7
%
 
1.8
%
 
2.4
%
Expected term, in years
0.2 - 6

 
6

 
1 - 6

Risk-free interest rate
0.1 - 1.1%

 
1.3 - 2.5%

 
0.4 - 2.9%
Stock options and SARs activity
The following table summarizes the activity during the year ended December 31, 2012 for stock option and SARs awards:
 
Shares
 
Weighted-Average Exercise Price
Outstanding at beginning of year
1,268,917

 
$
20.40

Granted
168,008

 
43.27

Exercised
(239,474
)
 
17.36

Forfeited
(6,030
)
 
36.06

Outstanding at end of year
1,191,421

 
$
24.16

Exercisable at end of year
844,679

 
$
18.92
Nonvested restricted shares activity
The following table summarizes the activity during the year ended December 31, 2012, for nonvested restricted share awards:
 
Shares
 
Weighted-Average Grant Date Fair Value
Nonvested at beginning of year
150,081

 
$
26.39

Granted
38,901

 
42.54

Vested
(46,628
)
 
18.47

Forfeited
—

 
—

Nonvested at end of year
142,354

 
$
33.40