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Financial risk management - Liquidity risk (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net undiscounted cash flows    
Payable to non-current asset suppliers $ 11,747 $ 5,411
Gross inflows and outflows    
Inflows 255,664 273,720
Outflows (261,793) (292,626)
Net cash flow (6,129) (18,906)
Discounted at the applicable interbank rates (23,463) (38,040)
Liquidity risk    
Net undiscounted cash flows    
Bank borrowings 141,012 1,003
Finance leases 66,471 89,108
Debt instruments 464,845 497,656
Financial loans from government agencies 68,083 93,894
Derivative financial instruments 6,129 18,906
Payables to related parties 11,128 12,973
Payable to non-current asset suppliers 11,747 5,411
Contingent consideration 40,584  
Trade and other payables 256,823 192,859
Contractual undiscounted payments 1,066,822 911,810
Not later than one year    
Gross inflows and outflows    
Inflows 18,047 18,198
Outflows (17,556) (18,793)
Net cash flow 491 (595)
Discounted at the applicable interbank rates 82 (995)
Not later than one year | Liquidity risk    
Net undiscounted cash flows    
Bank borrowings 8,191 1,003
Finance leases 12,999 15,379
Debt instruments 32,813 32,813
Financial loans from government agencies 58,758 88,127
Derivative financial instruments (491) 595
Payables to related parties 11,128 12,973
Payable to non-current asset suppliers 11,648 5,411
Contingent consideration 3,103  
Trade and other payables 256,823 192,859
Contractual undiscounted payments 394,972 349,160
Later than one year and not later than two years    
Gross inflows and outflows    
Inflows 18,047 17,996
Outflows (17,108) (18,199)
Net cash flow 939 (203)
Discounted at the applicable interbank rates 52 (985)
Later than one year and not later than two years | Liquidity risk    
Net undiscounted cash flows    
Finance leases 13,817 15,504
Debt instruments 32,813 32,813
Financial loans from government agencies 6,996 2,362
Derivative financial instruments (939) 203
Payable to non-current asset suppliers 99  
Contingent consideration 6,193  
Contractual undiscounted payments 58,979 50,882
Later than two years and not later than five years [member]    
Gross inflows and outflows    
Inflows 219,570 237,526
Outflows (227,129) (255,634)
Net cash flow (7,559) (18,108)
Discounted at the applicable interbank rates (23,597) (36,060)
Later than two years and not later than five years [member] | Liquidity risk    
Net undiscounted cash flows    
Bank borrowings 132,821  
Finance leases 39,655 58,225
Debt instruments 399,219 432,031
Financial loans from government agencies 1,822 2,349
Derivative financial instruments 7,559 18,108
Contingent consideration 18,530  
Contractual undiscounted payments 599,606 510,713
Later than five years [member] | Liquidity risk    
Net undiscounted cash flows    
Financial loans from government agencies 507 1,056
Contingent consideration 12,758  
Contractual undiscounted payments $ 13,265 $ 1,056