| (all amounts in thousands of U.S. dollars) | Year ended December 31, | |||||||||||
| 2017 | 2016 | 2015 | ||||||||||
| (i) Transactions | ||||||||||||
| (a) Sales of goods and services | ||||||||||||
| Sales of goods to non-consolidated parties | 32,362 | 21,174 | 24,019 | |||||||||
| Sales of goods to other related parties | 94,624 | 32,613 | 87,663 | |||||||||
| Sales of services to non-consolidated parties | 11,637 | 9,542 | 10,154 | |||||||||
| Sales of services to other related parties | 3,751 | 2,948 | 4,010 | |||||||||
142,374 | 66,277 | 125,846 | ||||||||||
| (b) Purchases of goods and services | ||||||||||||
| Purchases of goods to non-consolidated parties | 234,361 | 67,048 | 260,280 | |||||||||
| Purchases of goods to other related parties | 17,711 | 20,150 | 35,153 | |||||||||
| Purchases of services to non-consolidated parties | 12,077 | 11,528 | 16,153 | |||||||||
| Purchases of services to other related parties | 50,794 | 53,530 | 78,805 | |||||||||
314,943 | 152,256 | 390,391 | ||||||||||
| (all amounts in thousands of U.S. dollars) | At December 31, | |||||||
| 2017 | 2016 | |||||||
| (ii) Period-end balances | ||||||||
| (a) Arising from sales / purchases of goods / services | ||||||||
| Receivables from non-consolidated parties | 117,853 | 117,187 | ||||||
| Receivables from other related parties | 50,815 | 13,357 | ||||||
| Payables to non-consolidated parties | (49,354 | ) | (21,314 | ) | ||||
| Payables to other related parties | (14,475 | ) | (12,708 | ) | ||||
104,839 | 96,522 | |||||||