Pension Benefits | Other Postretirement Benefits | ||||||||||||||||||||||
For the Years Ended December 31, | For the Years Ended December 31, | ||||||||||||||||||||||
2013 | 2012 | 2011 | 2013 | 2012 | 2011 | ||||||||||||||||||
Components of net periodic benefit cost: | |||||||||||||||||||||||
Service cost | $ | 20,865 | $ | 20,466 | $ | 17,457 | $ | 18,680 | $ | 18,817 | $ | 13,677 | |||||||||||
Interest cost | 36,829 | 37,586 | 37,744 | 111,687 | 135,695 | 179,739 | |||||||||||||||||
Expected return on plan assets | (51,814 | ) | (46,157 | ) | (38,522 | ) | — | — | — | ||||||||||||||
Amortization of prior service (credits) | (1,611 | ) | (1,630 | ) | (666 | ) | (30,552 | ) | (51,828 | ) | (46,397 | ) | |||||||||||
Recognized net actuarial loss | 37,853 | 47,834 | 38,102 | 66,417 | 80,875 | 105,364 | |||||||||||||||||
Curtailment gain | (374 | ) | — | — | (39,650 | ) | — | — | |||||||||||||||
Settlement loss (gain) | 39,482 | — | — | (1,348,129 | ) | — | — | ||||||||||||||||
Net periodic benefit cost (credit) | $ | 81,230 | $ | 58,099 | $ | 54,115 | $ | (1,221,547 | ) | $ | 183,559 | $ | 252,383 | ||||||||||