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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Aug. 24, 2020
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ 60,500
Disposal Group, Including Discontinued Operation, Revenue | $ 0 | $ 32,378 | $ 0 | $ 68,544 |
Disposal Group Including Discontinued Operation Cash Proceeds |  |  | $ 64,100 |  |

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