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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Revenue and Expense Recognized for Advertising Barter Transactions

The amount of revenue and expense recognized for advertising barter transactions is as follows:

 

     2014      2013      2012  

Net revenues

    $ 7,839       $ 7,862       $ 6,798   

Direct advertising expenses

    $ 2,928       $ 3,005       $ 2,900   

General and administrative expenses

    $ 4,675       $ 4,417       $ 3,699