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Disclosures on equity (Details 3) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | $ (14,349,000) | $ (12,888,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | (931,000) | (1,119,000)
Closing balance | (14,999,000) | (14,349,000)
Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 3,500,000
Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | (1,394,000) | (5,450)
Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 5,723,000 | 2,184,000
Impaiment Of Equity Investments | (4,048,000) | (576,000)
Reserve of change in value of foreign currency basis spreads [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (24,913,000) | (19,463,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | 0 | 0
Closing balance | (26,307,000) | (24,913,000)
Reserve of change in value of foreign currency basis spreads [member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Reserve of change in value of foreign currency basis spreads [member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | (1,394,000) | (5,450,000)
Reserve of change in value of foreign currency basis spreads [member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 0
Impaiment Of Equity Investments | 0 | 0
Gains from cash flow hedge before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 2,248,000 | 89,000
Adjustments for Reclassification Of Gains and Losses In Other reserves | 0 | 0
Closing balance | 7,971,000 | 2,248,000
Gains from cash flow hedge before tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Gains from cash flow hedge before tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Gains from cash flow hedge before tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 5,723,000 | 2,159,000
Impaiment Of Equity Investments | 0 | 0
Gains from cash flow hedge tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 0 | (25,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | 0 | 0
Closing balance | 0 | 0
Gains from cash flow hedge tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Gains from cash flow hedge tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Gains from cash flow hedge tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 25,000
Impaiment Of Equity Investments | 0 | 0
Losses from measurement of defined benefit plans before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (6,847,000) | (5,446,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | (1,329) | (1,401,000)
Closing balance | (8,176,000) | (6,847,000)
Losses from measurement of defined benefit plans before tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Losses from measurement of defined benefit plans before tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Losses from measurement of defined benefit plans before tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 0
Impaiment Of Equity Investments | 0 | 0
Losses from measurement of defined benefit plans tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 894,000 | 612,000
Adjustments for Reclassification Of Gains and Losses In Other reserves | 398,000 | 282,000
Closing balance | 1,292,000 | 894,000
Losses from measurement of defined benefit plans tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Losses from measurement of defined benefit plans tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Losses from measurement of defined benefit plans tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 0
Impaiment Of Equity Investments | 0 | 0
Gains (losses) from financial assets measured at fair value through other comprehensive income before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 4,787,000 | 4,813,000
Adjustments for Reclassification Of Gains and Losses In Other reserves | 0 | 0
Closing balance | (759,000) | 4,787,000
Gains (losses) from financial assets measured at fair value through other comprehensive income before tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Gains (losses) from financial assets measured at fair value through other comprehensive income before tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Gains (losses) from financial assets measured at fair value through other comprehensive income before tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 0
Impaiment Of Equity Investments | (5,546) | (26,000)
Gains (losses) from financial assets measured at fair value through other comprehensive income tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (1,850,000) | (1,300,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | 0 | 0
Closing balance | (352,000) | (1,850,000)
Gains (losses) from financial assets measured at fair value through other comprehensive income tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Gains (losses) from financial assets measured at fair value through other comprehensive income tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Gains (losses) from financial assets measured at fair value through other comprehensive income tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 0
Impaiment Of Equity Investments | 1,498,000 | (550,000)
Miscellaneous other reserves before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | 11,332,000 | 7,832,000
Adjustments for Reclassification Of Gains and Losses In Other reserves | 0 | 0
Closing balance | 11,332,000 | 11,332,000
Miscellaneous other reserves before tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 3,500,000
Miscellaneous other reserves before tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Miscellaneous other reserves before tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 0
Impaiment Of Equity Investments | 0 | 0
Total reserves, reserves before tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (13,393,000) | (12,175,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | (1,329) | (1,401)
Closing balance | (15,939,000) | (13,393,000)
Total reserves, reserves before tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 3,500,000
Total reserves, reserves before tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | (1,394) | (5,450,000)
Total reserves, reserves before tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 5,723,000 | 2,159,000
Impaiment Of Equity Investments | (5,546) | (26,000)
Total reserves, reserves defered tax [Member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Opening balance | (956,000) | (713,000)
Adjustments for Reclassification Of Gains and Losses In Other reserves | 398,000 | 282,000
Closing balance | 940,000 | (956,000)
Total reserves, reserves defered tax [Member] | Subsidiaries [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Statutory reserve |  | 0
Total reserves, reserves defered tax [Member] | Associates [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Gains (losses) on exchange differences on translation, net of tax | 0 | 0
Total reserves, reserves defered tax [Member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of Disclosures on equity [Line Items] |  |
Impairment Of Debt Instruments | 0 | 25,000
Impaiment Of Equity Investments | $ 1,498,000 | $ (550,000)

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