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Financial instruments (Details 5) - Uncollateralized Portfolio [Member] $ in Thousands | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) Customer
--- | --- | ---
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Customer | 2,586 | 794
Portfolio under no renegotiated terms | $ 427,400 | $ 361,656
Number of customers under renegotiated terms | Customer | 0 | 0
Portfolio under renegotiated terms, gross | $ 0 | $ 0
Total gross portfolio | $ 427,400 | $ 361,656
Between 1 and 30 days [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Customer | 194 | 173
Portfolio under no renegotiated terms | $ 20,022 | $ 42,732
Number of customers under renegotiated terms | Customer | 0 | 0
Portfolio under renegotiated terms, gross | $ 0 | $ 0
Total gross portfolio | $ 20,022 | $ 42,732
Between 31 and 60 days [member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Customer | 68 | 59
Portfolio under no renegotiated terms | $ 9,909 | $ 7,218
Number of customers under renegotiated terms | Customer | 0 | 0
Portfolio under renegotiated terms, gross | $ 0 | $ 0
Total gross portfolio | $ 9,909 | $ 7,218
Between 61 and 90 days [member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Customer | 21 | 19
Portfolio under no renegotiated terms | $ 851 | $ 1,182
Number of customers under renegotiated terms | Customer | 0 | 0
Portfolio under renegotiated terms, gross | $ 0 | $ 0
Total gross portfolio | $ 851 | $ 1,182
More than 91 days [member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Customer | 21 | 40
Portfolio under no renegotiated terms | $ 8,102 | $ 6,452
Number of customers under renegotiated terms | Customer | 0 | 0
Portfolio under renegotiated terms, gross | $ 0 | $ 0
Total gross portfolio | $ 8,102 | $ 6,452
Current [member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Customer | 2,282 | 503
Portfolio under no renegotiated terms | $ 388,516 | $ 304,072
Number of customers under renegotiated terms | Customer | 0 | 0
Portfolio under renegotiated terms, gross | $ 0 | $ 0
Total gross portfolio | $ 388,516 | $ 304,072

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