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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash paid during the period for: |  |  |
Interest | $ 884 | $ 850 | $ 636
Income taxes | 2,864 | 2,420 | 6,555
Non-cash transactions: |  |  |
Barter revenue | 3,570 | 3,618 | 3,471
Barter expense | 3,677 | 3,367 | 3,217
Purchase of treasury shares in connection with exercise of stock options | 0 | 826 | 0
Acquisition of property and equipment | 11 | 8 | 49
Use of treasury shares for 401(k) match | $ 252 | $ 274 | $ 258

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