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Postretirement Benefit Plans (Plan Assets at Fair Value) (Details) - Scottdale Defined Benefit Pension Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 4,939 | $ 5,404 | $ 4,818
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 3,409 | 4,701 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,530 | 703 |
Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 522 | 2,797 |
Mining [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 23 | 34 |
Manufacturing [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 807 | 830 |
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 | 555 | 543 |
Wholesale Trade [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 17 |  |
Finance, Insurance, and Real Estate [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,348 | 330 |
Services [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 137 | 155 |
Other [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 12 |
Corporate debt securities [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 1,530 | $ 703 |

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