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Summary Of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]  
Advertising Costs
     Three Months Ended
March 31,		  
         2012              2011      

Advertising Costs

    $ 9,936       $ 9,365   
Internal-Use Software
     Three Months Ended
March 31,		  
         2012              2011      

Internal-use software development costs

    $ 4,696       $ 3,258