| Thousands of U.S. dollars | |||||
| 2015 (*) | 2016 (*) | 2017 | |||
| Supplies | |||||
| Subcontracted services | 34,088 | 29,940 | 26,885 | ||
| Infrastructure leases (Note 25b) | 4,236 | 3,376 | 11,889 | ||
| Purchases of materials | 1,434 | 986 | 628 | ||
| Communications | 31,714 | 24,929 | 25,003 | ||
| Expenses with labor unions | - | 1,204 | 1,156 | ||
| Other | 6,132 | 5,163 | 9,338 | ||
| Total | 77,604 | 65,598 | 74,899 | ||
| (*) Exclude discontinued operations - Morocco. | |||||