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Employee Benefit Plans (Components of Postretirement Benefit Expense) (Details) - Postretirement Medical and Life Benefit Plan - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 101 | $ 105 | $ 119
Interest Cost | 71 | 35 | 28
Amortization of Prior Service Costs | (3) | (2) | (2)
Amortization of Unrecognized Net (Gain) Loss | 32 | 43 | 55
Net Postretirement Benefit Expense | 201 | 181 | 200
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss) | 158 | (112) | (121)
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income | $ 359 | $ 69 | $ 79

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