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Income taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Income Taxes [Line Items] |  |  |  |
Net deferred tax asset | $ 57,377 | $ 63,722 |  |
Non-current deferred tax assets | 58,334 | 74,299 |  | $ 75,854
Non-current deferred tax liabilities | 957 | 10,577 |  |
Temporary differences related to investments in foreign subsidiaries | 141,431 |  |  |
Gross unrecognized tax benefits | 0 | 0 |  |
Income taxes withholdings on intercompany transactions | 7,723 | 6,804 | $ 22,379 |
Change in valuation allowance | 24,307 | 21,241 | 19,217 |
Non-current Assets |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax assets | 58,334 | 74,299 |  |
Non-current Liabilities |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax liabilities | 957 | 10,577 |  |
Tax Year 2009 to 2014 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimate of possible loss | 181,000 |  |  |
Venezuela |  |  |  |
Income Taxes [Line Items] |  |  |  |
Change in valuation allowance | $ 304 | $ 2,108 | 2,180 |
2016 Notes |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income taxes withholdings on intercompany transactions |  |  | $ 18,200 |

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