Net periodic benefit cost for the years ended December 31 included the following components:
| Retirement Plans | Other Benefits | |||||||||||||||||||||||
| 2013 | 2012 | 2011 | 2013 | 2012 | 2011 | |||||||||||||||||||
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Net periodic benefit cost: |
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Service cost |
$ | 5,005 | $ | 4,875 | $ | 4,160 | $ | 1,174 | $ | 1,113 | $ | 970 | ||||||||||||
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Interest cost |
8,495 | 8,697 | 8,926 | 2,074 | 2,275 | 2,584 | ||||||||||||||||||
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Expected return on assets |
(12,968 | ) | (12,017 | ) | (12,312 | ) | — | — | — | |||||||||||||||
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Amortization of: |
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Net actuarial loss |
5,775 | 5,759 | 4,062 | 1,160 | 1,153 | 1,305 | ||||||||||||||||||
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Prior service cost (credit) |
358 | 358 | 346 | (1,565 | ) | (1,565 | ) | (1,565 | ) | |||||||||||||||
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Net periodic benefit cost |
6,665 | 7,672 | 5,182 | 2,843 | 2,976 | 3,294 | ||||||||||||||||||
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Other changes in plan assets and benefit obligations recognized in other comprehensive income: |
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Net actuarial (gain) loss |
(30,540 | ) | 9,619 | 32,436 | (6,083 | ) | 1,110 | 1,743 | ||||||||||||||||
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Amortization of net actuarial loss |
(5,775 | ) | (5,759 | ) | (4,062 | ) | (1,160 | ) | (1,153 | ) | (1,305 | ) | ||||||||||||
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Amortization of prior service cost |
(358 | ) | (358 | ) | (346 | ) | 1,565 | 1,565 | 1,565 | |||||||||||||||
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Total recognized in other comprehensive income |
(36,673 | ) | 3,502 | 28,028 | (5,678 | ) | 1,522 | 2,003 | ||||||||||||||||
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Total recognized in net periodic benefit cost and other comprehensive income |
$ | (30,008 | ) | $ | 11,174 | $ | 33,210 | $ | (2,835 | ) | $ | 4,498 | $ | 5,297 | ||||||||||
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