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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Benefit Costs | Components of net periodic benefit (income) cost for the Company's defined benefit plans were as follows (in thousands):
| Three months ended |  | Six months ended
| June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
Pension and SERPA Benefits: |  |  |  |  |  |  |
Service cost | $ | 1,175 |  |  | $ | 1,294 |  |  | $ | 2,350 |  |  | $ | 2,588 |
Interest cost | 20,118 |  |  | 20,476 |  |  | 40,237 |  |  | 40,952 |
Expected return on plan assets | (33,143) |  |  | (36,519) |  |  | (66,286) |  |  | (73,038) |
Amortization of unrecognized: |  |  |  |  |  |  |
Prior service cost | 188 |  |  | 188 |  |  | 376 |  |  | 376 |
Net gain | (163) |  |  | (181) |  |  | (326) |  |  | (362) |
Settlement gain | — |  |  | — |  |  | — |  |  | (222) |
Special retirement benefit cost | 1,722 |  |  | — |  |  | 1,722 |  |  | — |
Net periodic benefit income | $ | (10,103) |  |  | $ | (14,742) |  |  | $ | (21,927) |  |  | $ | (29,706) |
Postretirement Healthcare Benefits: |  |  |  |  |  |  |
Service cost | $ | 723 |  |  | $ | 797 |  |  | $ | 1,446 |  |  | $ | 1,594 |
Interest cost | 2,694 |  |  | 2,772 |  |  | 5,388 |  |  | 5,544 |
Expected return on plan assets | (4,424) |  |  | (4,281) |  |  | (8,848) |  |  | (8,562) |
Amortization of unrecognized: |  |  |  |  |  |  |
Prior service cost (credit) | 149 |  |  | (166) |  |  | 298 |  |  | (332) |
Net gain | (1,250) |  |  | (1,097) |  |  | (2,500) |  |  | (2,194) |
Net periodic benefit income | $ | (2,108) |  |  | $ | (1,975) |  |  | $ | (4,216) |  |  | $ | (3,950) |

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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