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Disclosures on reserves in Equity (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Disclosures on equity [Line Items]      
Opening balance $ (14,223) $ (14,999) $ (14,349)
Increase in reserves 30,846 12,008 22,092
Decrease in Reserve (9,191) (11,232) (22,742)
Closing balance 7,432 (14,223) (14,999)
Reserve of change in value of foreign currency basis spreads [member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (25,745) (26,307) (24,913)
Increase in reserves 15,732 1,824 6,542
Decrease in Reserve (1,556) (1,262) (7,936)
Closing balance (11,569) (25,745) (26,307)
Gains from cash flow hedge before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 9,879 7,971 2,248
Increase in reserves 0 8,628 14,794
Decrease in Reserve (3,706) (6,720) (9,071)
Closing balance 6,173 9,879 7,971
Gains from cash flow hedge tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (2,683) 0 0
Increase in reserves 0 (2,683) 0
Decrease in Reserve 1,001 0 0
Closing balance (1,682) (2,683) 0
Losses from measurement of defined benefit plans before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (11,482) (8,176) (6,847)
Increase in reserves 3,858 0 674
Decrease in Reserve (2,903) (3,306) (2,003)
Closing balance (10,527) (11,482) (8,176)
Losses from measurement of defined benefit plans tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 1,992 1,292 894
Increase in reserves 430 0 (133)
Decrease in Reserve (575) 700 531
Closing balance 1,847 1,992 1,292
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 392 (760) 4,787
Increase in reserves 11,885 1,570 294
Decrease in Reserve (2,101) (418) (5,841)
Closing balance 10,176 392 (760)
Gains (losses) from financial assets measured at fair value through other comprehensive income tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (662) (351) (1,850)
Increase in reserves (3,180) (424) (79)
Decrease in Reserve 538 113 1,578
Closing balance (3,304) (662) (351)
Miscellaneous other reserves before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance 14,086 11,332 11,332
Increase in reserves 2,121 3,093 0
Decrease in Reserve 111 (339) 0
Closing balance 16,318 14,086 11,332
Total reserves, reserves before tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (12,870) (15,940) (13,393)
Increase in reserves 33,596 15,115 22,304
Decrease in Reserve (10,155) (12,045) (24,851)
Closing balance 10,571 (12,870) (15,940)
Total reserves, reserves defered tax [Member]      
Disclosure of Disclosures on equity [Line Items]      
Opening balance (1,353) 941 (956)
Increase in reserves (2,750) (3,107) (212)
Decrease in Reserve 964 813 2,109
Closing balance $ (3,139) $ (1,353) $ 941