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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service Cost | $ 69 | $ 50 | $ 41
Interest Cost | 34 | 29 | 29
Amortization of Unrecognized Net (Gain) Loss | 32 | 8 | 6
Net Postretirement Benefit Expense | 135 | 87 | 76
Net Gain (Loss) During Period Recognized in Other Comprehensive Income (Loss) | 41 | 218 | 18
Total Recognized in Net Postretirement Benefit Expense and Other Comprehensive Income | $ 176 | $ 305 | $ 94

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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