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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Weighted Average Assumptions Used in Estimating Fair Value of Options and SARs

The following are the weighted average assumptions used in estimating the fair value of our SARs:

 

     Year Ended December 31,  
             2012     2011     2010          
  

 

 

  

Expected life of SARs (in years)

      6          5          5          

Expected volatility

              33.45 %      30.37 %      35.99%   

Dividend yield

      .78 %      .76 %      .70%   

Risk free interest rate

      .89 %      1.54 %      1.88%   
Summary of Activity Under Stock Plan

A summary of activity under the Stock Plan as of December 31, 2012 and changes during the year then ended is as follows:

 

     Number of
Awards		      Weighted-
Average
Exercise Price		     

Weighted-

Average
Remaining
Contractual
Term

(Years)

     

Aggregate
Intrinsic
Value

(In
Thousands)

  
  

 

 

  

Awards outstanding at January 1, 2012

      998,160              $     85.01             

Granted

      282,200              $ 64.33             

Exercised

      (9,968)             $ 51.57             

Forfeited

      (4,644)             $ 68.73             

Expired

      (36,268)             $ 94.14             
  

 

 

           

Awards outstanding at December 31, 2012

          1,229,480              $ 80.32             7.0             $     3,515   
  

 

 

           

Awards exercisable at December 31, 2012

      810,457              $ 86.86             6.0             $ 2,141