Pension Benefits | ||||||||||||
Year Ended December 31 | 2011 | 2012 | 2013 | |||||||||
Service cost | $ | 245 | $ | 266 | $ | 298 | ||||||
Interest cost | 517 | 523 | 492 | |||||||||
Expected return on plan assets | (599 | ) | (588 | ) | (590 | ) | ||||||
Recognized net actuarial loss | 173 | 287 | 409 | |||||||||
Amortization of prior service credit | (43 | ) | (42 | ) | (67 | ) | ||||||
Annual benefit cost | $ | 293 | $ | 446 | $ | 542 | ||||||
Other Post-retirement Benefits | ||||||||||||
Year Ended December 31 | 2011 | 2012 | 2013 | |||||||||
Service cost | $ | 13 | $ | 12 | $ | 15 | ||||||
Interest cost | 62 | 59 | 53 | |||||||||
Expected return on plan assets | (31 | ) | (30 | ) | (29 | ) | ||||||
Recognized net actuarial loss | 4 | 10 | 26 | |||||||||
Amortization of prior service cost | 6 | 7 | 7 | |||||||||
Annual benefit cost | $ | 54 | $ | 58 | $ | 72 | ||||||