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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 110 | $ 83 | $ 69
Interest Cost | 41 | 43 | 34
Amortization of Prior Service Costs | 2 | 0 | 0
Amortization of Unrecognized Net (Gain) Loss | 64 | 37 | 32
Net Postretirement Benefit Expense | 217 | 163 | 135
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss) | 15 | 273 | 41
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income | $ 232 | $ 436 | $ 176

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