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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)