Pension Benefits | Other Postretirement Benefits | |||||||||||||||||
2013 | 2012 | 2011 | 2013 | 2012 | 2011 | |||||||||||||
Service cost | $ | 1 | $ | 92 | $ | 102 | $ | — | $ | 2 | $ | 5 | ||||||
Interest cost | 238 | 250 | 259 | 11 | 14 | 20 | ||||||||||||
Expected return on plan assets | (315 | ) | (312 | ) | (298 | ) | (14 | ) | (14 | ) | (14 | ) | ||||||
Amortization of prior service credit | — | (9 | ) | (9 | ) | (7 | ) | (4 | ) | (1 | ) | |||||||
Amortization of actuarial loss | 59 | 231 | 159 | 2 | 1 | — | ||||||||||||
Settlements | — | 1 | — | — | — | — | ||||||||||||
Curtailment gain due to plan freeze | — | (11 | ) | — | — | (1 | ) | — | ||||||||||
Net periodic benefit cost | $ | (17 | ) | $ | 242 | $ | 213 | $ | (8 | ) | $ | (2 | ) | $ | 10 | |||