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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s defined benefit plans were as follows (in thousands):
|  | Pension Benefits |
|  | Pension Plans |  |  | SERP |
|  | Three Months Ended June 30, |  |  | Three Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 956 |  |  | $ | 1,658 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 4,572 |  |  |  | 3,640 |  |  |  | 10 |  |  |  | 8 |
Expected return on plan assets |  |  | (5,732 | ) |  |  | (7,154 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | — |  |  |  | 132 |  |  |  | 6 |  |  |  | 8 |
Net periodic benefit cost |  | $ | (204 | ) |  | $ | (1,724 | ) |  | $ | 16 |  |  | $ | 16 |
|  | Pension Benefits |
|  | Pension Plans |  |  | SERP |
|  | Six Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,848 |  |  | $ | 3,269 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 9,178 |  |  |  | 7,362 |  |  |  | 21 |  |  |  | 15 |
Expected return on plan assets |  |  | (11,455 | ) |  |  | (14,296 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | — |  |  |  | 242 |  |  |  | 12 |  |  |  | 15 |
Net periodic benefit cost |  | $ | (429 | ) |  | $ | (3,423 | ) |  | $ | 33 |  |  | $ | 30 |
Other Postretirement Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s postretirement benefit plan were as follows (in thousands):
|  | Other Postretirement Benefits |
|  | Postretirement Welfare Plan |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 5 |  |  | $ | 4 |  |  | $ | 11 |  |  | $ | 8 |
Amortization of actuarial gain |  |  | (86 | ) |  |  | (99 | ) |  |  | (172 | ) |  |  | (197 | )
Net periodic benefit cost |  | $ | (81 | ) |  | $ | (95 | ) |  | $ | (161 | ) |  | $ | (189 | )

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