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Financial instruments (Details 4) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Financial instruments [Line Items] |  |
Total Gross Book Value | $ 464,855,000 | $ 446,875,000
Credit exposure | $ 21,668 | $ 20,811
Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 6,728,000 | 10,274
Portfolio under no renegotiated terms | $ 442,340,000 | $ 422,380,000
Number of customers under renegotiated terms | Pure | 1,232,000 | 1,074
Portfolio under renegotiated terms, gross | $ 3,330,000 | $ 5,020,000
Between 1 and 30 days [Member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 0.00% | 0.00%
Total Gross Book Value | $ 18,495,000 | $ 42,434,000
Credit exposure | $ 0 | $ 0
Between 1 and 30 days [Member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 1,284,000 | 1,598
Portfolio under no renegotiated terms | $ 17,899,000 | $ 41,510,000
Number of customers under renegotiated terms | Pure | 390,000 | 376
Portfolio under renegotiated terms, gross | $ 596,000 | $ 924,000
Between 31 and 60 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 87.00% | 0.00%
Total Gross Book Value | $ 8,181,000 | $ 9,085,000
Credit exposure | $ 7,147 | $ 0
Between 31 and 60 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 940,000 | 824
Portfolio under no renegotiated terms | $ 8,063,000 | $ 8,813,000
Number of customers under renegotiated terms | Pure | 154,000 | 130
Portfolio under renegotiated terms, gross | $ 118,000 | $ 272,000
Between 61 and 90 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 100.00% | 27.00%
Total Gross Book Value | $ 2,222,000 | $ 3,859,000
Credit exposure | $ 2,222 | $ 1,061
Between 61 and 90 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 661,000 | 756
Portfolio under no renegotiated terms | $ 2,147,000 | $ 3,740,000
Number of customers under renegotiated terms | Pure | 41,000 | 50
Portfolio under renegotiated terms, gross | $ 75,000 | $ 119,000
More than 91 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 100.00% | 74.00%
Total Gross Book Value | $ 12,299,000 | $ 26,514,000
Credit exposure | $ 12,299 | $ 19,750
Between 121 and 150 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 85,000 | 182
Portfolio under no renegotiated terms | $ 385,000 | $ 2,914,000
Number of customers under renegotiated terms | Pure | 16,000 | 22
Portfolio under renegotiated terms, gross | $ 29,000 | $ 56,000
Between 151 and 180 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 49,000 | 443
Portfolio under no renegotiated terms | $ 177,000 | $ 5,602,000
Number of customers under renegotiated terms | Pure | 21,000 | 45
Portfolio under renegotiated terms, gross | $ 176,000 | $ 75,000
Between 181 and 210 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 14,000 | 365
Portfolio under no renegotiated terms | $ 1,289,000 | $ 4,470,000
Number of customers under renegotiated terms | Pure | 41,000 | 27
Portfolio under renegotiated terms, gross | $ 231,000 | $ 45,000
Between 211 and 250 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 12,000 | 682
Portfolio under no renegotiated terms | $ 107,000 | $ 112,000
Number of customers under renegotiated terms | Pure | 101,000 | 29
Portfolio under renegotiated terms, gross | $ 242,000 | $ 138,000
More than 250 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 1,756,000 | 1,837
Portfolio under no renegotiated terms | $ 7,258,000 | $ 3,050,000
Number of customers under renegotiated terms | Pure | 305,000 | 350
Portfolio under renegotiated terms, gross | $ 1,148,000 | $ 2,631,000
Current [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 0.00% | 0.00%
Total Gross Book Value | $ 404,473,000 | $ 345,508,000
Credit exposure | $ 0 | $ 0
Current [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 1,429,000 | 3,039
Portfolio under no renegotiated terms | $ 403,805,000 | $ 344,802,000
Number of customers under renegotiated terms | Pure | 136,000 | 23
Portfolio under renegotiated terms, gross | $ 668,000 | $ 706,000
Between 91 and 120 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Pure | 498,000 | 548
Portfolio under no renegotiated terms | $ 1,210,000 | $ 7,367,000
Number of customers under renegotiated terms | Pure | 27,000 | 22
Portfolio under renegotiated terms, gross | $ 47,000 | $ 54,000

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