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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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:

 

 

 

2018

 

 

2017

 

 

2016

 

Net revenues

 

$

8,955

 

 

$

8,469

 

 

$

8,051

 

Direct advertising expenses

 

$

3,633

 

 

$

3,603

 

 

$

3,559

 

General and administrative expenses

 

$

4,758

 

 

$

4,332

 

 

$

4,067