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Financial risk management - Changes in liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 07, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in liabilities arising from financing activities [abstract]        
Beginning of period   $ 571,337 $ 514,587  
Reclassification of business held for sale     86,959  
Changes from financing cash flows   94,737 (103,868)  
Effect of changes in foreign exchange rates   (10,109) 26,541  
Changes in fair value   (12,841) 31,614  
Other changes   2,265 15,504  
End of period   645,389 571,337 $ 514,587
Dividends paid   (20,642)   (54,988)
Proceeds from stock option exercises   240 180  
Other amounts paid due to financing activities   (932) (9,709)  
Payments to acquire or redeem own shares $ (20,100) (20,100)    
Cash flows from (used in) financing activities   53,303 (113,397) 49,917
Bank borrowings.        
Changes in liabilities arising from financing activities [abstract]        
Beginning of period   1,003 421,291  
Changes from financing cash flows   140,781 (426,641)  
Effect of changes in foreign exchange rates   (772) 1,916  
Other changes     4,437  
End of period   141,012 1,003 421,291
Obligations under finance leases.        
Changes in liabilities arising from financing activities [abstract]        
Beginning of period   82,633 5,237  
Reclassification of business held for sale     81,383  
Changes from financing cash flows   (12,948) (14,610)  
Effect of changes in foreign exchange rates   (3,214) 10,623  
End of period   66,471 82,633 5,237
Debt instruments        
Changes in liabilities arising from financing activities [abstract]        
Beginning of period   350,270    
Changes from financing cash flows     337,383  
Other changes   2,324 12,887  
End of period   352,594 350,270  
Financial loans from government agencies        
Changes in liabilities arising from financing activities [abstract]        
Beginning of period   99,391 87,360  
Changes from financing cash flows   (33,096)    
Effect of changes in foreign exchange rates   (4,446) 12,031  
End of period   61,849 99,391 87,360
Derivative financial instruments        
Changes in liabilities arising from financing activities [abstract]        
Beginning of period   38,040 699  
Reclassification of business held for sale     5,576  
Effect of changes in foreign exchange rates   (1,677) 1,971  
Changes in fair value   (12,841) 31,614  
Other changes   (59) (1,820)  
End of period   $ 23,463 $ 38,040 $ 699