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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (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 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Asset impairments and costs associated with exit and disposal activities, net of adjustments | $ 1,464 | $ 1,209 | $ 3,595 | $ 1,799 |  |  |
(Gain)/loss on asset impairments and divestitures |  |  | 519 | 185 |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | (10,900) | (11,900) |  |  |
Cost-method investment, OTTI | 0 | (186) | 0 |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | (6,328) | (86) |  |  |
Payments for Restructuring |  |  | (1,933) |  |  |  |
Goodwill, Impairment Loss | 0 | 46,792 | 0 | 46,792 |  |  |
Restructuring Reserve | 1,563 |  | 1,563 |  | $ 1,563 |  | $ 776
kaleo |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | (4,300) | 2,100 | (28,482) | (11,900) |  |  |
Unrealized Gain Loss On Investments Net Of Tax | 3,400 |  | 23,400 |  |  |  |
Other Interest and Dividend Income |  |  | 17,582 |  |  |  |
PE Films |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pretax charges for severance and other employee-related costs | 100 |  | 600 |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | 3,834 | (2,355) | 933 | (4,542) |  |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | 0 | 0 | 0 | 0 |  |  |
Aluminum Extrusions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Accelerated Depreciation Expense | (2,510) | 0 | (2,510) | 0 |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | (610) | (297) | (667) | (396) |  |  |
Severance |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  | 2,043 |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Payments for Restructuring |  |  | (1,212) |  |  |  |
Restructuring Reserve | 1,447 |  | 1,447 |  | 1,447 |  | $ 616
Film Products Manufacturing Facility In Shanghai, China [Member] |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other |  |  | 6,300 |  |  |  |
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Other Restructuring Costs after Taxes |  |  |  |  | 4,000 |  |
Pretax charges for severance and other employee-related costs |  |  | 101 |  |  |  |
Other Restructuring Costs |  |  | 600 |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets | 6,316 | $ 0 | 6,316 | 0 |  |  |
Payments for Restructuring | 200 |  | 700 |  | $ 3,200 |  |
Alleghany and Bath County, Virginia [Member] |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Cost-method investment, OTTI |  |  |  | $ (186) |  |  |
PE Films | Other Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  | 628 |  |  |  |
Personal Care Materials [Member] | PE Films Products Manufacturing Facility Restag Hungary [Domain] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Inventory Write-down | 200 |  |  |  |  |  |
Personal Care Materials [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Other Restructuring Costs after Taxes | 1,900 |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  | 720 |  |  | $ 1,800 |
Accelerated Depreciation Expense |  |  |  |  |  | 1,600 |
Losses Associated With Plant Shutdowns Asset Impairments Restructurings Unusual Items Gains Losses From Sale Of Assets Other Items |  |  |  |  |  | 5,000 |
Other Restructuring Costs |  |  | 0 |  |  | 5,100 |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  |  |  | 700 |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  | 7,600 |
Payments for Restructuring | 200 |  | 200 |  |  |  |
Personal Care Materials [Member] | PE Films Personal Care European Operations [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Other Restructuring Costs after Taxes | 700 |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  | 594 |  |  |  |
Other Restructuring Costs |  |  | $ 0 |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  | $ 1,700 |
Payments for Restructuring | 100 |  |  |  |  |  |
Personal Care Materials [Member] | Films Products Manufacturing Facility Guangzhou China [Domain] | Other Restructuring [Member] | PE Films |  |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | $ 400 |  |  |  |  |  |

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