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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 | 16 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (loss) on investment in kaléo accounted for under fair value method |  |  | $ 10,900 | $ 11,900 |  |
Restructuring and Related Cost, Incurred Cost |  |  | 3,595 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
January 1, 2019 |  |  | 776 |  |  |
Cash payments |  |  | 1,933 |  |  |
Charges against assets |  |  | (875) |  |  |
September 30, 2019 | $ 1,563 |  | 1,563 |  | $ 1,563 |
Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  | 2,043 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
January 1, 2019 |  |  | 616 |  |  |
Cash payments |  |  | 1,212 |  |  |
Charges against assets |  |  | 0 |  |  |
September 30, 2019 | 1,447 |  | 1,447 |  | 1,447 |
Long Lived Asset Impairment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  | 875 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
January 1, 2019 |  |  | 0 |  |  |
Cash payments |  |  | 0 |  |  |
Charges against assets |  |  | (875) |  |  |
September 30, 2019 | 0 |  | 0 |  | 0 |
Other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Other Restructuring Costs |  |  | 677 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
January 1, 2019 |  |  | 160 |  |  |
Cash payments |  |  | 721 |  |  |
Charges against assets |  |  | 0 |  |  |
September 30, 2019 | 116 |  | 116 |  | 116 |
Aluminum Extrusions [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Other Restructuring Costs |  |  | 52 |  |  |
PE Films | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  | 628 |  |  |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  | 573 |  |  |
Restructuring and Related Cost, Incurred Cost |  |  | 1,253 |  |  |
PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs | 100 |  | 600 |  |  |
PE Films | Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  | 101 |  |  |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  | 0 |  |  |
Other Restructuring Costs |  |  | 600 |  |  |
Restructuring and Related Cost, Incurred Cost |  |  | 700 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Cash payments | (200) |  | (700) |  | $ (3,200) |
kaleo [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Gain (loss) on investment in kaléo accounted for under fair value method | 4,300 | $ (2,100) | 28,482 | $ 11,900 |  |
Personal Care Materials [Member] | PE Films | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  | 720 |  |  | $ 1,800
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  | 200 |  |  |
Other Restructuring Costs |  |  | 0 |  |  | $ 5,100
Restructuring and Related Cost, Incurred Cost |  |  | 900 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Cash payments | (200) |  | (200) |  |  |
Personal Care Materials [Member] | PE Films | PE Films Personal Care European Operations [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  | 594 |  |  |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  | 100 |  |  |
Other Restructuring Costs |  |  | 0 |  |  |
Restructuring and Related Cost, Incurred Cost |  |  | $ 700 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Cash payments | $ (100) |  |  |  |  |

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