| Summary of Defined Benefit Pension Plan and Other Postretirement Defined Benefit Plan |
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Pension Benefits |
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Other Postretirement Benefits |
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Three Months Ended
March 31, |
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Three Months Ended
March 31, |
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2015 |
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2014 |
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2015 |
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2014 |
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Service cost
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$ |
107 |
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$ |
114 |
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$ |
7 |
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$ |
24 |
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Interest cost
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2,938 |
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3,335 |
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161 |
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225 |
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Recognized actuarial loss (gain)
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170 |
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71 |
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(283 |
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(84 |
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Amortization of prior service credits
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— |
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— |
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(2,457 |
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(2,494 |
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Expected return on plan assets
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(3,477 |
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(3,814 |
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— |
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— |
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Net periodic benefit income
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$ |
(262 |
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$ |
(294 |
) |
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$ |
(2,572 |
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$ |
(2,329 |
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