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Postretirement Benefit Plans (Plan Assets at Fair Value) (Details) - Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 5,404 | $ 4,818 | $ 8,121
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 4,701 | 4,268 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 703 | 550 |
Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 2,797 | 2,430 |
Mining [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 34 | 36 |
Manufacturing [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 830 | 888 |
Transportation, Communications, Electric, Gas, and Sanitary Services [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 543 | 468 |
Finance, Insurance, and Real Estate [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 330 | 248 |
Services [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 155 | 189 |
Other [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 12 | 9 |
Corporate debt securities [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 703 | $ 550 |

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