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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs, included in other operating expenses on the condensed consolidated statements of income, for the three and six months ended June 30, 2019 and 2018 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended June 30, |  | Three months ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 3,169 |  |  | $ | 3,570 |  |  | $ | 757 |  |  | $ | 636 |
Interest cost |  | 1,931 |  |  | 1,357 |  |  | 579 |  |  | 529 |
Expected return on plan assets |  | (1,692 | ) |  | (2,213 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) |  | 61 |  |  | 82 |  |  | (329 | ) |  | (329 | )
Amortization of prior actuarial losses |  | 1,231 |  |  | 769 |  |  | 644 |  |  | 498 |
Net periodic benefit cost |  | $ | 4,700 |  |  | $ | 3,565 |  |  | $ | 1,651 |  |  | $ | 1,334 |
|  | Pension Benefits |  | Other Benefits
|  | Six months ended June 30, |  | Six months ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 6,307 |  |  | $ | 6,224 |  |  | $ | 1,514 |  |  | $ | 1,272 |
Interest cost |  | 3,317 |  |  | 2,687 |  |  | 1,159 |  |  | 1,059 |
Expected return on plan assets |  | (3,576 | ) |  | (3,767 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) |  | 121 |  |  | 165 |  |  | (658 | ) |  | (658 | )
Amortization of prior actuarial losses |  | 2,142 |  |  | 1,863 |  |  | 1,288 |  |  | 996 |
Net periodic benefit cost |  | $ | 8,311 |  |  | $ | 7,172 |  |  | $ | 3,303 |  |  | $ | 2,669 |

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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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