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Description of the Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
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:

 

 

 

2020

 

 

2019

 

 

2018

 

Net revenues

 

$

8,088

 

 

$

9,636

 

 

$

8,955

 

Direct advertising expenses

 

$

3,971

 

 

$

3,982

 

 

$

3,633

 

General and administrative expenses

 

$

3,144

 

 

$

4,986

 

 

$

4,758