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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash paid during the period for: |  |  |
Interest | $ 311 | $ 635 | $ 884
Income taxes | 1,099 | 3,893 | 2,864
Non-cash transactions: |  |  |
Barter revenue | 2,014 | 3,560 | 3,570
Barter expense | 1,881 | 3,370 | 3,677
Acquisition of property and equipment | 6 | 28 | 11
Use of treasury shares for 401(k) match | $ 250 | $ 262 | $ 252

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