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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Supplemental non-cash investing and financing activities: |  |
Value of common stock issued in acquisitions | $ 3,268 | $ 1,014
Exercise of stock options by common stock surrender | 50 | 1,126
Supplemental cash payment information: |  |
Interest paid | 1,459 | 1,043
Income taxes paid, net of refunds | $ 1,663 | $ 3,044

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