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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract] |
Components of supplemental cash flow information | Supplemental cash flow information is as follows (in thousands):
| Three months ended March 31,
| 2015 |  | 2014
Supplemental non-cash investing and financing activities: |  |  |
Value of common stock issued in acquisitions | $ | 1,014 |  |  | $ | 1,750 |
Value of common stock issued in payment of accrued liability | — |  |  | 600 |
Exercise of stock options by common stock surrender | 66 |  |  | 1,005 |
Supplemental cash payment information: |  |  |
Interest paid | $ | 309 |  |  | $ | 360 |
Income taxes paid | 1,911 |  |  | 2,039 |

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