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Retirement Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Employees' Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 402 | $ 380 | $ 802 | $ 846
Interest Cost | 577 | 595 | 1,161 | 1,120
Expected Return on Plan Assets | (977) | (923) | (1,986) | (1,855)
Amortization of Prior Service Cost | 48 | 33 | 95 | 66
Amortization of Net Loss (Gain) | 0 | 0 | 0 | 0
Net Periodic Benefit Cost (Benefit) | 50 | 85 | 72 | 177
Plan Contributions During the Period | 0 | 0 | 0 | 0
Estimated Future Contributions in the Current Fiscal Year | 0 |  | 0 |
Select Executive Retirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 21 | 22 | 47 | 39
Interest Cost | 76 | 2 | 148 | 160
Expected Return on Plan Assets | 0 | 0 | 0 | 0
Amortization of Prior Service Cost | 10 | 10 | 20 | 20
Amortization of Net Loss (Gain) | 0 | (9) | 0 | 12
Net Periodic Benefit Cost (Benefit) | 107 | 25 | 215 | 231
Plan Contributions During the Period | 128 | 128 | 248 | 255
Estimated Future Contributions in the Current Fiscal Year | 248 |  | 248 |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 5 | 8 | 16 | 23
Interest Cost | 60 | 79 | 139 | 160
Expected Return on Plan Assets | 0 | 0 | 0 | 0
Amortization of Prior Service Cost | 25 | 25 | 51 | 51
Amortization of Net Loss (Gain) | (159) | (82) | (255) | (169)
Net Periodic Benefit Cost (Benefit) | (69) | 30 | (49) | 65
Plan Contributions During the Period | 34 | $ 54 | 91 | $ 81
Estimated Future Contributions in the Current Fiscal Year | $ 91 |  | $ 91 |

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