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Disclosures on equity (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | $ (12,888) | $ (19,797)
Increase (decrease) in reserves | (1,218) | 9,123
Deferred taxes | (243) | (849)
Reclassification of loss in reserves | 0 | (1,365)
Closing balance | (14,349) | (12,888)
Reserve of change in value of foreign currency basis spreads [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (19,463) | (14,035)
Increase (decrease) in reserves | (5,450) | (5,428)
Deferred taxes | 0 | 0
Reclassification of loss in reserves | 0 | 0
Closing balance | (24,913) | (19,463)
Reserve for cash flow hedges before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 89 | (2,144)
Increase (decrease) in reserves | 2,159 | 3,626
Deferred taxes | 0 | 0
Reclassification of loss in reserves | 0 | (1,393)
Closing balance | 2,248 | 89
Reserve for cash flow hedges tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (25) | 445
Increase (decrease) in reserves | 0 | 0
Deferred taxes | 25 | (470)
Reclassification of loss in reserves | 0 | 0
Closing balance | 0 | (25)
Reserve for remeasurements of defined benefit plans before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (5,446) | (2,077)
Increase (decrease) in reserves | (1,401) | (3,397)
Deferred taxes | 0 | 0
Reclassification of loss in reserves | 0 | 28
Closing balance | (6,847) | (5,446)
Reserve for remeasurements of defined benefit plans deferred tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 612 | (309)
Increase (decrease) in reserves |  | 0
Deferred taxes | 282 | 921
Reclassification of loss in reserves | 0 | 0
Closing balance | 894 | 612
Reserve for gains and losses on financial assets measured at fair value through other comprehensive income before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 4,813 | 0
Increase (decrease) in reserves | (26) | 4,813
Deferred taxes | 0 | 0
Reclassification of loss in reserves | 0 | 0
Closing balance | 4,787 | 4,813
Reserve for gains and losses on financial assets measured at fair value through other comprehensive income deferred tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (1,300) | 0
Increase (decrease) in reserves | 0 | 0
Deferred taxes | (550) | (1,300)
Reclassification of loss in reserves | 0 | 0
Closing balance | (1,850) | (1,300)
Miscellaneous other reserves before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 7,832 | (1,677)
Increase (decrease) in reserves | 3,500 | 9,509
Deferred taxes | 0 | 0
Reclassification of loss in reserves | 0 | 0
Closing balance | 11,332 | 7,832
Total reserves, reserves before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (12,175) | (19,933)
Increase (decrease) in reserves | (1,218) | 9,123
Deferred taxes | 0 | 0
Reclassification of loss in reserves | 0 | (1,365)
Closing balance | (13,393) | (12,175)
Total reserves, reserves defered tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (713) | 136
Increase (decrease) in reserves | 0 | 0
Deferred taxes | (243) | (849)
Reclassification of loss in reserves | 0 | 0
Closing balance | $ (956) | $ (713)

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