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Plants Shutdowns, Asset Impairments, Restructurings And Other (Schedule Of Accrued Expenses Associated With Asset Impairments And Exit And Disposal Activities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 19 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |  |
January 1, 2018 |  |  | $ 1,103 |  |
Charges |  |  | 1,891 |  |
Cash spent |  |  | (1,243) |  |
Charges against assets |  |  | 92 |  |
September 30, 2018 | $ 1,751 |  | 1,751 |  |
Restructuring Reserve, Accrual Adjustment |  |  | (92) |  |
Severance (a) |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
January 1, 2018 |  |  | 627 |  |
Charges |  |  | 1,871 |  |
Cash spent |  |  | (933) |  |
September 30, 2018 | 1,565 |  | 1,565 |  |
Long Lived Asset Impairment [Member] |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
January 1, 2018 |  |  | 0 |  |
Charges |  |  | 0 |  |
Cash spent |  |  | 0 |  |
Charges against assets |  |  | 92 |  |
September 30, 2018 | 0 |  | 0 |  |
Restructuring Reserve, Accrual Adjustment |  |  | (92) |  |
Other |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
January 1, 2018 |  |  | 476 |  |
Charges |  |  | 20 |  |
Cash spent |  |  | (310) |  |
Charges against assets |  |  | 0 |  |
September 30, 2018 | 186 |  | 186 |  |
PE Films |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Severance Costs | 200 | $ 100 | 300 | $ 100 |
PE Films | Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Severance Costs | 1,300 |  | $ 1,700 |  | $ 3,600
Restructuring Reserve [Roll Forward] |  |  |  |  |
Cash spent | (100) |  |  |  |
Severance Costs - Cost of Goods Sold | $ 200 |  |  |  |

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