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Retirement Benefits | 9 Months Ended
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Sep. 30, 2019
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit credit were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2019 |  | Sept. 30, 2018 |  | Sept. 30, 2019 |  | Sept. 30, 2018
| (Dollars in thousands)
Service cost | $ | 2,871 |  |  | $ | 3,411 |  |  | $ | 9,383 |  |  | $ | 10,842 |
Interest cost | 7,149 |  |  | 6,348 |  |  | 21,241 |  |  | 18,953 |
Expected return on plan assets | (15,200 | ) |  | (17,137 | ) |  | (45,425 | ) |  | (51,382 | )
Amortization of prior service cost | 46 |  |  | 34 |  |  | 86 |  |  | 103 |
Amortization of actuarial losses | 4,084 |  |  | 1,877 |  |  | 12,324 |  |  | 5,450 |
Net periodic benefit credit | $ | (1,050 | ) |  | $ | (5,467 | ) |  | $ | (2,391 | ) |  | $ | (16,034 | )
The components of the net periodic other postretirement benefit (credit) cost were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2019 |  | Sept. 30, 2018 |  | Sept. 30, 2019 |  | Sept. 30, 2018
| (Dollars in thousands)
Service cost | $ | 16 |  |  | $ | 15 |  |  | $ | 60 |  |  | $ | 78 |
Interest cost | 200 |  |  | 158 |  |  | 569 |  |  | 483 |
Amortization of prior service (credit) cost | (586 | ) |  | 561 |  |  | (1,749 | ) |  | (738 | )
Amortization of actuarial gains | (33 | ) |  | (167 | ) |  | (366 | ) |  | (405 | )
Net periodic benefit (credit) cost | $ | (403 | ) |  | $ | 567 |  |  | $ | (1,486 | ) |  | $ | (582 | )

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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