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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Supplemental non-cash investing and financing activities: |  |
Value of common stock issued in acquisitions | $ 0 | $ 1,014
Exercise of stock options by common stock surrender | 0 | 66
Supplemental cash payment information: |  |
Interest paid | 382 | 309
Income taxes paid, net of refunds | $ 2,264 | $ 1,911

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