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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2011
Significant Accounting Policies [Abstract]  
Revenue and expense recognized for advertising barter transactions
                         
    2011     2010     2009  

Net revenues

   $ 7,153     $ 6,608     $ 5,642  

Direct advertising expenses

   $ 2,766     $ 2,768     $ 2,808  

General and administrative expenses

   $ 3,524     $ 3,242     $ 2,867