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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract] |
Components of supplemental cash flow information | Supplemental cash flow information is as follows (in thousands):
| Year ended December 31,
| 2015 |  | 2014 |  | 2013
Supplemental non-cash investing and financing activities: |  |  |  |  |
Value of common stock issued in acquisitions | $ | 1,014 |  |  | $ | 2,043 |  |  | $ | 52,711 |
Final Florida Chemical acquisition adjustment | — |  |  | 1,162 |  |  | — |
Value of common stock issued in payment of accrued liability | — |  |  | 600 |  |  | — |
Equipment acquired through capital leases | — |  |  | — |  |  | 754 |
Exercise of stock options by common stock surrender | 1,332 |  |  | 1,198 |  |  | 3,907 |
Supplemental cash payment information: |  |  |  |  |
Interest paid | $ | 1,398 |  |  | $ | 1,285 |  |  | $ | 1,859 |
Income taxes paid, net of refunds | 1,547 |  |  | 22,389 |  |  | 17,783 |

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