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Retirement Plans, Expected Employer Contribution and Benefit Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Pension Plan [Member] |  |
Expected employer contributions [Abstract] |  |
First year | $ 1,770 | $ 8,374
Expected benefit payments (gross) [Abstract] |  |
Year one | 16,696 | 16,312
Year two | 17,513 | 16,899
Year three | 18,169 | 17,808
Year four | 19,096 | 18,650
Year five | 19,860 | 19,707
Next five years | 108,717 | 110,417
SERP [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 0 | 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 108 | 108
Year two | 103 | 104
Year three | 98 | 99
Year four | 93 | 94
Year five | 88 | 90
Next five years | 337 | 359
Other Postretirement Benefits [Member] |  |
Expected employer contributions [Abstract] |  |
First year | 0 | 0
Expected benefit payments (gross) [Abstract] |  |
Year one | 47 | 50
Year two | 46 | 49
Year three | 44 | 47
Year four | 43 | 45
Year five | 41 | 43
Next five years | $ 167 | $ 176

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