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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