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Financial instruments (Details 4) $ in Thousands | Dec. 31, 2020 USD ($) Numbers | Dec. 31, 2019 USD ($) Numbers
--- | --- | ---
Financial instruments [Line Items] |  |
Total Gross Book Value | $ 365,206 | $ 399,142
Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 1,587 | 1,861
Portfolio under no renegotiated terms | $ 325,726 | $ 381,049
Number of customers under renegotiated terms | Numbers | 110 | 304
Portfolio under renegotiated terms, gross | $ 1,860 | $ 2,726
Receivables due from related parties, current [Member] |  |
Financial instruments [Line Items] |  |
Total Gross Book Value | 70,145 | 72,550
Credit exposure | $ 7,545 | $ 11,323
Between 1 and 30 days [Member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 10.00% | 18.00%
Total Gross Book Value | $ 12,200 | $ 20,721
Credit exposure | $ 1,207 | $ 3,664
Between 1 and 30 days [Member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 119 | 166
Portfolio under no renegotiated terms | $ 12,140 | $ 20,195
Number of customers under renegotiated terms | Numbers | 8 | 72
Portfolio under renegotiated terms, gross | $ 60 | $ 526
Between 31 and 60 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 39.00% | 34.00%
Total Gross Book Value | $ 1,226 | $ 1,288
Credit exposure | $ 477 | $ 440
Between 31 and 60 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 12 | 26
Portfolio under no renegotiated terms | $ 1,226 | $ 1,279
Number of customers under renegotiated terms | Numbers | 0 | 4
Portfolio under renegotiated terms, gross | $ 0 | $ 10
Between 61 and 90 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 52.00% | 44.00%
Total Gross Book Value | $ 159 | $ 573
Credit exposure | $ 83 | $ 251
Between 61 and 90 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 5 | 12
Portfolio under no renegotiated terms | $ 159 | $ 519
Number of customers under renegotiated terms | Numbers | 0 | 3
Portfolio under renegotiated terms, gross | $ 0 | $ 54
More than 91 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 79.00% | 78.00%
Total Gross Book Value | $ 11,883 | $ 8,370
Credit exposure | $ 9,367 | $ 6,552
Between 121 and 150 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 2 | 5
Portfolio under no renegotiated terms | $ 2,384 | $ 361
Number of customers under renegotiated terms | Numbers | 2 | 7
Portfolio under renegotiated terms, gross | $ 2 | $ 49
Between 151 and 180 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 3 | 7
Portfolio under no renegotiated terms | $ 1,398 | $ 190
Number of customers under renegotiated terms | Numbers | 4 | 2
Portfolio under renegotiated terms, gross | $ 12 | $ 33
Between 181 and 210 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 1 | 4
Portfolio under no renegotiated terms | $ 0 | $ 51
Number of customers under renegotiated terms | Numbers | 2 | 0
Portfolio under renegotiated terms, gross | $ 5 | $ 0
Between 211 and 250 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 3 | 6
Portfolio under no renegotiated terms | $ 2 | $ 48
Number of customers under renegotiated terms | Numbers | 6 | 8
Portfolio under renegotiated terms, gross | $ 114 | $ 11
More than 250 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 156 | 144
Portfolio under no renegotiated terms | $ 5,030 | $ 5,449
Number of customers under renegotiated terms | Numbers | 64 | 137
Portfolio under renegotiated terms, gross | $ 1,447 | $ 1,085
Current [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 1.00% | 1.00%
Total Gross Book Value | $ 302,118 | $ 352,823
Credit exposure | $ 3,187 | $ 5,285
Current [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 1,281 | 1,486
Portfolio under no renegotiated terms | $ 301,939 | $ 351,931
Number of customers under renegotiated terms | Numbers | 23 | 69
Portfolio under renegotiated terms, gross | $ 179 | $ 892
Between 91 and 120 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 5 | 5
Portfolio under no renegotiated terms | $ 1,448 | $ 1,026
Number of customers under renegotiated terms | Numbers | 1 | 2
Portfolio under renegotiated terms, gross | $ 41 | $ 66
Trade [Member] |  |
Financial instruments [Line Items] |  |
Total Gross Book Value | 327,586 | 383,775
Credit exposure | $ 14,321 | $ 16,192

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