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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

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