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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2015
Supplemental Cash Flow Elements [Abstract] |
Components of supplemental cash flow information | Supplemental cash flow information is as follows (in thousands):
| Six months ended June 30,
| 2015 |  | 2014
Supplemental non-cash investing and financing activities: |  |  |
Value of common stock issued in acquisitions | $ | 1,014 |  |  | $ | 1,900 |
Value of common stock issued in payment of accrued liability | — |  |  | 600 |
Exercise of stock options by common stock surrender | 1,126 |  |  | 1,005 |
Supplemental cash payment information: |  |  |
Interest paid | $ | 641 |  |  | $ | 710 |
Income taxes paid | 2,549 |  |  | 13,884 |

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