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Stock-Based Compensation Plans (Tables)
3 Months Ended
Mar. 31, 2012
Stock-Based Compensation Plans [Abstract]  
Weighted-Average Assumptions For The Employee Stock Option Plan
                 
     Three Months Ended
March 31,
 
     2012     2011  

Dividend yield

     2.60     2.73

Expected volatility

     44.07     40.39

Risk-free interest rate

     1.01     2.24

Expected term of options (in years)

     4.03        4.05   

Weighted-average grant-date fair value

   $ 7.06      $ 8.36