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Financial instruments (Details 4) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial instruments [Line Items] |  |  |  |
Assets before allowances | $ 469,598,000 | $ 392,217,000 |  |
Allowance for doubtful trade receivables | (20,811,000) | (21,616,000) | $ 19,731,000 | $ 18,980
Assets for trade receivables, net | 448,787,000 | 370,601,000 |  |
Receivables related to credit operations, current [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 427,400,000 | 361,656,000 |  |
Allowance for doubtful trade receivables | (15,079,000) | (16,817,000) |  |
Assets for trade receivables, net | 412,321,000 | 344,839,000 |  |
Trade receivables, current [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 427,400,000 | 361,656,000 |  |
Allowance for doubtful trade receivables | (15,079,000) | (16,817,000) |  |
Assets for trade receivables, net | 412,321,000 | 344,839,000 |  |
Prepayments, current [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 16,877,000 | 9,421,000 |  |
Allowance for doubtful trade receivables | (700,000) | (2,800,000) |  |
Assets for trade receivables, net | 16,177,000 | 6,621,000 |  |
Other receivables, current [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 23,409,000 | 19,300,000 |  |
Allowance for doubtful trade receivables | (5,032,000) | (1,999,000) |  |
Assets for trade receivables, net | 18,377,000 | 17,301,000 |  |
Current trade and other receivables [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 40,286,000 | 28,721,000 |  |
Allowance for doubtful trade receivables | (5,732,000) | (4,799,000) |  |
Assets for trade receivables, net | 34,554,000 | 23,922,000 |  |
Other receivables, non-current [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 1,912,000 | 1,840,000 |  |
Allowance for doubtful trade receivables | 0 | 0 |  |
Assets for trade receivables, net | 1,912,000 | 1,840,000 |  |
Non-current receivables [Member] |  |  |  |
Financial instruments [Line Items] |  |  |  |
Assets before allowances | 1,912,000 | 1,840,000 |  |
Allowance for doubtful trade receivables | 0 | 0 |  |
Assets for trade receivables, net | $ 1,912,000 | $ 1,840,000 |  |

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