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Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract] |
Components of supplemental cash flow information | Supplemental cash flow information is as follows (in thousands):
| Nine months ended September 30,
| 2016 |  | 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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