| Thousands of U.S. dollars | |||||
| 2015 (*) | 2016 | 2017 | |||
| Employee benefit expenses | |||||
| Salaries and wages | 1,087,390 | 1,014,830 | 1,076,810 | ||
| Social security | 131,268 | 120,923 | 131,524 | ||
| Supplementary pension contributions | 3,240 | 2,848 | 2,861 | ||
| Termination benefits | 35,654 | 34,654 | 33,744 | ||
| Other welfare costs | 152,974 | 136,646 | 184,137 | ||
| Total | 1,410,526 | 1,309,901 | 1,429,076 | ||
| (*) Exclude discontinued operations - Morocco. | |||||