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Disclosures on reserves in Equity (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Disclosures on equity [Line Items]      
Opening balance $ (14,999) $ (14,349) $ (12,888)
Increase in reserves 12,008 22,092 16,434
Decrease in Reserve (11,232) (22,742) (17,895)
Closing balance (14,223) (14,999) (14,349)
Reserve of change in value of foreign currency basis spreads [member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (26,307) (24,913) (19,463)
Increase in reserves 1,824 6,542 1,992
Decrease in Reserve (1,262) (7,936) (7,442)
Closing balance (25,745) (26,307) (24,913)
Gains from cash flow hedge before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 7,971 2,248 64
Increase in reserves 8,628 14,794 4,068
Decrease in Reserve (6,720) (9,071) (1,884)
Closing balance 9,879 7,971 2,248
Gains from cash flow hedge tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 0 0 0
Increase in reserves (2,683) 0 0
Decrease in Reserve 0 0 0
Closing balance (2,683) 0 0
Losses from measurement of defined benefit plans before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (8,176) (6,847) (5,446)
Increase in reserves 0 674 1,092
Decrease in Reserve (3,306) (2,003) (2,493)
Closing balance (11,482) (8,176) (6,847)
Losses from measurement of defined benefit plans tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 1,292 894 612
Increase in reserves 0 (133) (308)
Decrease in Reserve 700 531 590
Closing balance 1,992 1,292 894
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 (760) 4,787 4,813
Increase in reserves 1,570 294 6,090
Decrease in Reserve (418) (5,841) (6,116)
Closing balance 392 (760) 4,787
Gains (losses) from financial assets measured at fair value through other comprehensive income tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (351) (1,850) (1,300)
Increase in reserves (424) (79) 0
Decrease in Reserve 113 1,578 (550)
Closing balance (662) (351) (1,850)
Miscellaneous other reserves before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 11,332 11,332 7,832
Increase in reserves 3,093 0 3,500
Decrease in Reserve (339) 0 0
Closing balance 14,086 11,332 11,332
Total reserves, reserves before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (15,940) (13,393) (12,200)
Increase in reserves 15,115 22,304 16,742
Decrease in Reserve (12,045) (24,851) (17,935)
Closing balance (12,870) (15,940) (13,393)
Total reserves, reserves defered tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 941 (956) (688)
Increase in reserves (3,107) (212) (308)
Decrease in Reserve 813 2,109 40
Closing balance $ (1,353) $ 941 $ (956)