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Financial risk management (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial risk management [Line Items]    
Bank borrowings $ 83,760 $ 164,780
Unsecured obligations 1,598,730 1,321,640
Subtotal 69,170 163,568
Hedging liabilities 50,430 9,140
Derivative financial instruments 160 800
Subtotal 50,590 9,940
Trade accounts payable and other accounts payable 163,751 196,280
Total 1,733,080 1,496,360
LaterThanOneYear [Member]    
Financial risk management [Line Items]    
Bank borrowings 4,100 164,780
Unsecured obligations 61,370 47,450
Subtotal 65,470 212,230
Hedging liabilities 5,520 37,010
Derivative financial instruments 160 800
Subtotal 5,680 37,810
Trade accounts payable and other accounts payable 163,170 196,180
Total 234,320 446,220
Later than one year and not later than five years [member]    
Financial risk management [Line Items]    
Bank borrowings 79,660 0
Unsecured obligations 823,760 522,520
Subtotal 903,420 522,520
Hedging liabilities 15,640 (9,510)
Derivative financial instruments 0 0
Subtotal 15,640 (9,510)
Trade accounts payable and other accounts payable 580 100
Total 919,640 513,110
Later than five years [member]    
Financial risk management [Line Items]    
Bank borrowings 0 0
Unsecured obligations 713,600 751,670
Subtotal 713,600 751,670
Hedging liabilities 29,270 (18,360)
Derivative financial instruments 0 0
Subtotal 29,270 (18,360)
Trade accounts payable and other accounts payable 0 0
Total 742,870 733,310
Gross carrying amount [member]    
Financial risk management [Line Items]    
Bank borrowings 70,250 163,570
Unsecured obligations 1,273,070 1,054,890
Subtotal 1,343,320 1,218,460
Hedging liabilities (14,340) 2,838,000
Derivative financial instruments 160 80,000
Subtotal (14,180) 2,918,000
Trade accounts payable and other accounts payable 163,750 19,628,000
Total $ 1,492,890 $ 1,247,640