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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Non-cash investing and financing activities: |  |  |
Purchase of property, plant, and equipment in accounts payable | $ 4,430 | $ 2,389 | $ 4,522
Additional cash payment information: |  |  |
Interest paid | 1,611 | 1,578 | 1,489
Income taxes paid | $ 7,111 | $ 8,818 | $ 13,526

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