The maturity of these accounts at the end of each period is as follows:
| As of | As of | |||||||
| December 31, | December 31, | |||||||
| 2017 | 2016 | |||||||
| ThUS$ | ThUS$ | |||||||
| Fully performing | 1,040,671 | 907,358 | ||||||
| Matured accounts receivable, but not impaired | ||||||||
| Expired from 1 to 90 days | 34,153 | 27,651 | ||||||
| Expired from 91 to 180 days | 10,141 | 9,303 | ||||||
| More than 180 days overdue (*) | 2,922 | 1,567 | ||||||
| Total matured accounts receivable, but not impaired | 47,216 | 38,521 | ||||||
| Matured accounts receivable and impaired Judicial, pre-judicial collection and protested documents | 43,175 | 34,909 | ||||||
| Debtor under pre-judicial collection process and portfolio sensitization | 44,734 | 42,145 | ||||||
| Total matured accounts receivable and impaired | 87,909 | 77,054 | ||||||
| Total | 1,175,796 | 1,022,933 | ||||||
(*) Value of this segment corresponds primarily to accounts receivable that were evaluated in their ability to recover, therefore not requiring a provision.