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Description of the Business and Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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