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Pension and Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract] |
Schedule of Components of Net Periodic Benefit Cost (Credit) | The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:
|  | Pension |  |  | Postretirement Benefits |
|  | Three Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (Dollars in Thousands) |
Service cost |  | $ | 7,617 |  |  | $ | 7,684 |  |  | $ | 14 |  |  | $ | 16 |
Interest cost |  |  | 9,300 |  |  |  | 8,252 |  |  |  | 125 |  |  |  | 134 |
Expected return on assets |  |  | (11,824 | ) |  |  | (12,403 | ) |  |  | — |  |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 1 |  |  |  | 26 |  |  |  | (185 | ) |  |  | (426 | )
Actuarial loss (gain) |  |  | 3,941 |  |  |  | 3,117 |  |  |  | (109 | ) |  |  | (48 | )
Net periodic benefit cost (credit) |  | $ | 9,035 |  |  | $ | 6,676 |  |  | $ | (155 | ) |  | $ | (324 | )
|  | Pension |  |  | Postretirement Benefits |
|  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (Dollars in Thousands) |
Service cost |  | $ | 15,422 |  |  | $ | 15,832 |  |  | $ | 48 |  |  | $ | 38 |
Interest cost |  |  | 18,856 |  |  |  | 16,613 |  |  |  | 281 |  |  |  | 259 |
Expected return on assets |  |  | (23,930 | ) |  |  | (23,032 | ) |  |  | — |  |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 3 |  |  |  | 52 |  |  |  | (399 | ) |  |  | (1,037 | )
Actuarial loss (gain) |  |  | 7,918 |  |  |  | 6,413 |  |  |  | (248 | ) |  |  | (105 | )
Net periodic benefit cost (credit) |  | $ | 18,269 |  |  | $ | 15,878 |  |  | $ | (318 | ) |  | $ | (845 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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