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Financial risk management (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial risk management [Line Items]    
Bank borrowings $ 77,040 $ 83,760
Unsecured obligations 2,125,010 1,598,730
Subtotal 2,202,050 1,682,490
Hedging liabilities 63,270 50,430
Derivative financial instruments 3,170 2,860
Subtotal 66,440 53,290
Current and non-current lease liabilities 22,983  
Trade accounts payable and other accounts payable 205,790 163,751
Total 1,518,926 1,517,727
Less than 1 year [member]    
Financial risk management [Line Items]    
Bank borrowings 2,170 4,100
Unsecured obligations 326,340 61,370
Subtotal 328,510 65,470
Hedging liabilities 6,570 5,520
Derivative financial instruments 3,170 2,860
Subtotal 9,740 8,380
Current and non-current lease liabilities 8,903  
Trade accounts payable and other accounts payable 205,700 163,170
Total 552,853 237,020
1 to 5 years [member]    
Financial risk management [Line Items]    
Bank borrowings 74,870 79,660
Unsecured obligations 614,290 823,760
Subtotal 689,160 903,420
Hedging liabilities 24,330 15,640
Derivative financial instruments 0 0
Subtotal 24,330 15,640
Trade accounts payable and other accounts payable 0 580
Total 736,473 919,640
Over 5 years [member]    
Financial risk management [Line Items]    
Bank borrowings 0 0
Unsecured obligations 1,184,380 713,600
Subtotal 1,184,380 713,600
Hedging liabilities 32,370 29,270
Derivative financial instruments 0 0
Subtotal 32,370 29,270
Trade accounts payable and other accounts payable 0 0
Total 1,227,496 742,870
Carrying amount [Member]    
Financial risk management [Line Items]    
Bank borrowings 70,190 70,250
Unsecured obligations 1,697,110 1,273,070
Subtotal 1,767,300 1,343,320
Hedging liabilities 23,660 17,320
Derivative financial instruments 3,170 2,860
Subtotal 26,830 20,180
Current and non-current lease liabilities 42,632  
Trade accounts payable and other accounts payable 205,700 163,750
Total $ 2,042,462 $ 1,527,250