Pension benefit plans Years ended December 31, | Other benefit plans Years ended December 31, | |||||||||||||||||
2017 | 2016 | 2015 | 2017 | 2016 | 2015 | |||||||||||||
$ | $ | $ | $ | $ | $ | |||||||||||||
Balances – Beginning of the year | 13,197 | 12,375 | 14,619 | 217 | 281 | 433 | ||||||||||||
Current service cost | 107 | 87 | 103 | 14 | 13 | 14 | ||||||||||||
Interest cost | 237 | 282 | 260 | 3 | — | 8 | ||||||||||||
Actuarial (gain) loss arising from changes in financial assumptions | (694 | ) | 1,479 | (844 | ) | (115 | ) | — | (34 | ) | ||||||||
Benefits paid | (485 | ) | (399 | ) | (410 | ) | (66 | ) | (60 | ) | (97 | ) | ||||||
Impact of foreign exchange rate changes | 1,783 | (627 | ) | (1,353 | ) | 31 | (17 | ) | (43 | ) | ||||||||
Balances – End of the year | 14,145 | 13,197 | 12,375 | 84 | 217 | 281 | ||||||||||||
Amounts recognized: | ||||||||||||||||||
In net loss | (344 | ) | (369 | ) | (363 | ) | 98 | (13 | ) | 12 | ||||||||
In other comprehensive loss | (1,089 | ) | (852 | ) | 2,197 | (31 | ) | 17 | 43 |
$ | |||
2018 | 522 | ||
2019 | 541 | ||
2020 | 553 | ||
2021 | 558 | ||
2022 | 564 | ||
Thereafter | 16,589 | ||
19,327 |