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

Expected volatility

     36     34

Expected term (in years)

     5.7        5.7   

Risk-free interest rate

     1.0     2.1

Expected dividend yield

     None        None   
Summary Of Employee Stock Options Activity
Summary Of RSU Awards Activity
Classification Of Stock-Based Compensation Expense