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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2017
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,
| 2017 |  | 2016
Supplemental non-cash investing and financing activities: |  |  |
Value of common stock issued in payment of accrued liability | $ | 188 |  |  | $ | — |
Exercise of stock options by common stock surrender | 5,814 |  |  | — |
Supplemental cash payment information: |  |  |
Interest paid | $ | 1,069 |  |  | $ | 921 |
Income taxes received, net of payments (paid, net of refunds) | 9,489 |  |  | (3,429 | )

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