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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
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 119 | $ 110 | $ 83
Interest Cost | 28 | 41 | 43
Amortization of Prior Service Costs | (2) | 2 | 0
Amortization of Unrecognized Net (Gain) Loss | 55 | 64 | 37
Net Postretirement Benefit Expense | 200 | 217 | 163
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss) | (121) | 15 | 273
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income | $ 79 | $ 232 | $ 436

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