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Related party transactions and balances (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related party transactions and balances |  |  |
Non-current receivables due from related parties | $ 2,288 | $ 2,400 |
Receivables, Non Current | 2,288 | 2,400 |
Receivables, Current | 14,226 | 4,572 |
Payables, Current | 11,128 | 12,973 |
Sales and Operating Income | 43,792 | 17,222 | $ 21,766
Cost of Sales | 99,981 | 94,049 | 74,548
Staff costs |  |  | 10,080
Other Operating Expenses | 6,209 | 8,859 | 8,272
Finance Income | 72 | 224 | 74
Inmobiliaria Espacio, S.A. |  |  |
Related party transactions and balances |  |  |
Receivables, Current | 2,953 | 3,033 |
Payables, Current | $ 7 | 4 |
Short term loan maturity | P1Y |  |
Staff costs |  |  |
Other Operating Expenses | 6 | 2 | 2
Finance Income | 72 | 70 | 74
Grupo Villar Mir, S.A.U. |  |  |
Related party transactions and balances |  |  |
Receivables, Current | 79 | 83 |
Sales and Operating Income |  |  | 403
Energya VM Generacion, S.L |  |  |
Related party transactions and balances |  |  |
Receivables, Current | 11,154 | 1,420 |
Payables, Current | 70 | 6 |
Sales and Operating Income | 43,772 | 17,222 | 20,553
Staff costs |  |  |
Other Operating Expenses | 272 | 226 | 503
Energya VM Generacion, S.L | Grupo FerroAtlantica, S.A.U |  |  |
Related party transactions and balances |  |  |
Sales and Operating Income | 31,898 | 9,803 | 15,398
Energya VM Generacion, S.L | Hidro-Nitro Espanola, S.A. - Other segments - Energy |  |  |
Related party transactions and balances |  |  |
Sales and Operating Income | 11,874 | 7,419 | 5,155
Energya VM Gestion, S.L |  |  |
Related party transactions and balances |  |  |
Cost of Sales | 42 |  | 253
Staff costs |  |  |
Other Operating Expenses | 119 | 22 |
Marco International |  |  |
Related party transactions and balances |  |  |
Sales and Operating Income |  |  | 765
Cost of Sales |  |  | 5,212
Villar Mir Energia, S.L.U. |  |  |
Related party transactions and balances |  |  |
Non-current receivables due from related parties | 2,288 |  |
Receivables, Non Current |  | 2,398 |
Receivables, Current | 38 | 35 |
Payables, Current | 8,941 | 12,065 |
Sales and Operating Income |  |  | 45
Cost of Sales | 99,939 | 94,049 | 69,083
Staff costs |  |  |
Other Operating Expenses | 1,467 | 3,362 | 3,626
Villar Mir Energia, S.L.U. | Grupo Ferroatlantica And Hidro Nitro Espanola [Member] |  |  |
Related party transactions and balances |  |  |
Obligation for purchase of energy plus service charge | 99,939 | 94,049 | 69,083
Espacio Information Technology, S.A.U. |  |  |
Related party transactions and balances |  |  |
Payables, Current | 1,514 | 861 |
Staff costs |  |  |
Other Operating Expenses | 4,226 | 3,807 | 4,049
Blue Power Corporation, S.L. |  |  |
Related party transactions and balances |  |  |
Payables, Current | 134 | 29 |
Other related parties |  |  |
Related party transactions and balances |  |  |
Receivables, Non Current |  | 2 |
Receivables, Current | 2 | 1 |
Payables, Current | 462 | 8 |
Sales and Operating Income | 20 |  |
Staff costs |  |  |
Other Operating Expenses | 119 | 1,440 | 92
Finance Income |  | 154 |
Key management personnel |  |  |
Related party transactions and balances |  |  |
Staff costs |  |  | $ 10,080
Aurinka And Blue Power Corporation, S.L. | Grupo FerroAtlantica, S.A.U |  |  |
Related party transactions and balances |  |  |
Purchase of property, plant and equipment | $ 4,252 | $ 3,611 |

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