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Pension And Other Post-Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs | The components of net periodic benefit cost for the pension and other post-retirement benefit programs reflected in the consolidated statements of income are shown below:
| Pension Benefits |  | Other Post-Retirement Benefits
| Three Months Ended March 31, |  | Three Months Ended March 31,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 5 |  |  | $ | 58 |  |  | $ | 10 |  |  | $ | 9 |
Interest cost | 2,882 |  |  | 3,164 |  |  | 69 |  |  | 76 |
Expected return on plan assets | (3,761 | ) |  | (3,736 | ) |  | — |  |  | — |
Amortization of prior service costs, (gains) losses and net transition asset | 3,428 |  |  | 3,123 |  |  | (54 | ) |  | (61 | )
Net periodic benefit cost | $ | 2,554 |  |  | $ | 2,609 |  |  | $ | 25 |  |  | $ | 24 |

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- Definition Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs [Table Text Block] + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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