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Postretirement Benefit Plans (Plan Assets at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Nov. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Scottdale Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | $ 5,302 |  | $ 4,939 | $ 5,404
Scottdale Defined Benefit Pension Plan [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 3,891 |  | 3,409 |
Scottdale Defined Benefit Pension Plan [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 1,411 |  | 1,530 |
Scottdale Defined Benefit Pension Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 670 |  | 522 |
Scottdale Defined Benefit Pension Plan [Member] | Mining [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 43 |  | 23 |
Scottdale Defined Benefit Pension Plan [Member] | Manufacturing [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 870 |  | 807 |
Scottdale Defined Benefit Pension Plan [Member] | 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 | 500 |  | 555 |
Scottdale Defined Benefit Pension Plan [Member] | Wholesale Trade [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 23 |  |  |
Scottdale Defined Benefit Pension Plan [Member] | Finance, Insurance, and Real Estate [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 1,633 |  | 17 |
Scottdale Defined Benefit Pension Plan [Member] | Services [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 145 |  | 1,348 |
Scottdale Defined Benefit Pension Plan [Member] | Other [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets |  |  | 137 |
Scottdale Defined Benefit Pension Plan [Member] | Corporate debt securities [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 7 |  |  |
Scottdale Defined Benefit Pension Plan [Member] | Corporate debt securities [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 1,411 |  | $ 1,530 |
Riverview Defined Benefit Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 8,984 | $ 8,894 |  |
Riverview Defined Benefit Plan [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 8,598 |  |  |
Riverview Defined Benefit Plan [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 386 |  |  |
Riverview Defined Benefit Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 133 |  |  |
Riverview Defined Benefit Plan [Member] | Large-cap Value [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 376 |  |  |
Riverview Defined Benefit Plan [Member] | Large-cap Core [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 382 |  |  |
Riverview Defined Benefit Plan [Member] | Mid-cap Core [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 465 |  |  |
Riverview Defined Benefit Plan [Member] | Small-cap Core [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 306 |  |  |
Riverview Defined Benefit Plan [Member] | International Growth [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 592 |  |  |
Riverview Defined Benefit Plan [Member] | International Value [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 305 |  |  |
Riverview Defined Benefit Plan [Member] | Large Cap Growth [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 727 |  |  |
Riverview Defined Benefit Plan [Member] | Small / Midcap Growth [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 157 |  |  |
Riverview Defined Benefit Plan [Member] | Fixed Income - Core Plus [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 2,020 |  |  |
Riverview Defined Benefit Plan [Member] | Intermediate Duration - Government Credit [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 671 |  |  |
Riverview Defined Benefit Plan [Member] | Long Duration - Government Credit [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 1,697 |  |  |
Riverview Defined Benefit Plan [Member] | Long U.S. Treasury - ETF [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | 767 |  |  |
Riverview Defined Benefit Plan [Member] | Large Cap Value [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan fair value of plan assets | $ 386 |  |  |

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