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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Components of supplemental cash flow information | Supplemental cash flow information is as follows (in thousands):
| Year ended December 31,
| 2017 |  | 2016 |  | 2015
Supplemental non-cash investing and financing activities: |  |  |  |  |
Value of common stock issued in acquisitions | $ | — |  |  | $ | 3,268 |  |  | $ | 1,014 |
Value of common stock issued in payment of accrued liability | 188 |  |  | — |  |  | — |
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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