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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental non-cash investing and financing activities: |  |  |
Value of common stock issued in acquisitions | $ 0 | $ 3,268 | $ 1,014
Value of common stock issued in payment of accrued liability | 188 | 0 | 0
Exercise of stock options by common stock surrender | 5,863 | 50 | 1,332
Supplemental cash payment information: |  |  |
Interest paid | 1,851 | 2,024 | 1,398
Income taxes (received, net of payments) paid, net of refunds | $ (10,195) | $ 333 | $ 1,547

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