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Supplemental cash flow information (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Supplemental Cash Flow Information [Abstract] |  |
Summary of supplemental cash flow information |
| Three months ended March 31,
| 2017 | 2016
Cash paid for: |  |
Interest | $ | 174 |  | $ | 160 |
Income taxes | 3,049 |  | 2,596 |
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Cash paid for: |  |  |  |  |  |
Interest | $ | 19,511 |  |  | $ | 18,781 |  |  | $ | 19,066 |
Income/withholding taxes (1) | 13,904 |  |  | 24,125 |  |  | 12,189 |
Non-cash investing activities: |  |  |  |  |  |  |
Accrued capital costs | $ | 3,018 |  |  | $ | 777 |  |  | $ | 744 |
(1) | We paid withholding taxes in Iceland on intercompany dividends of zero, $8,388 and $5,491 during the years ended December 31, 2016, 2015 and 2014, respectively. Such withholding taxes are then refunded to us in the following year.

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