| | | 12-31-2017 | | 12-31-2016 | |
| Classes of Intangible Assets, Net | | ThU.S.$ | | ThU.S.$ | |
| Intangible assets, net | | 88,615 | | 89,497 | |
| Computer software | | 26,747 | | 26,370 | |
| Water rights | | 5,697 | | 5,689 | |
| Customer | | 47,144 | | 50,982 | |
| Other identifiable intangible assets | | 9,027 | | 6,456 | |
| Classes of intangible Assets, Gross | | 173,426 | | 159,025 | |
| Computer software | | 81,907 | | 72,008 | |
| Water rights | | 5,697 | | 5,689 | |
| Customer | | 72,685 | | 71,275 | |
| Other identifiable intangible assets | | 13,137 | | 10,053 | |
| Classes of accumulated amortization and impairment | | | | | |
| Total accumulated amortization and impairment | | (84,811) | | (69,528) | |
| Accumulated amortization and impairment, intangible assets | | (84,811) | | (69,528) | |
| Computer software | | (55,160) | | (45,638) | |
| Customer | | (25,541) | | (20,293) | |
| Other identifiable intangible assets | | (4,110) | | (3,597) | |