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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2020
Retirement Benefits, Description [Abstract] |
Schedule of Net Benefit Costs | For the three and six months ended June 30, 2020 and 2019, the components of net periodic benefit cost are as follows:
| Three months ended June 30 |  |  |  | Six months ended June 30 |  |
(Dollars in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 3,682 |  |  | $ | 3,271 |  |  | $ | 7,139 |  |  | $ | 6,384 |
Interest cost | 8,568 |  |  | 9,338 |  |  | 17,099 |  |  | 18,629 |
Expected return on assets | (16,435) |  |  | (15,661) |  |  | (32,844) |  |  | (31,296) |
Amortization of prior service cost | — |  |  | 14 |  |  | — |  |  | 28 |
Amortization of net actuarial loss | 6,398 |  |  | 2,721 |  |  | 12,662 |  |  | 5,462 |
Net periodic cost (benefit) | $ | 2,213 |  |  | $ | (317) |  |  | $ | 4,056 |  |  | $ | (793) |

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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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