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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended | 19 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2017 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on asset impairments |  |  |  |  | $ 519 | $ 223 | $ 101,282 |  |  |
Unrealized gain (loss) on investments under fair value method |  |  |  |  | 10,900 | 30,600 | 33,800 |  |  |
Goodwill, Impairment Loss |  |  |  |  | 0 | 46,792 | 0 |  |  |
kaleo |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments under fair value method | [1] |  |  |  | 28,482 | 30,600 | 33,800 |  |  |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 23,400 | 23,900 |  |  |  |
PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 52 |  |  |  |  |
Alleghany and Bath County, Virginia |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments under fair value method |  |  |  |  | 0 | (186) | 0 |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  | 0 | (38) | 0 |  |  |
Unrealized Gain (Loss) on Investment Property |  |  |  |  | 0 | 186 | 0 |  |  |
Employee Severance [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 2,417 |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  | 2,654 | 589 |  |  |
Restructuring Reserve Reversed to Income |  |  |  |  |  | 0 |  |  |  |
Payments for Restructuring |  |  |  |  | (1,739) | (2,665) | (1,816) |  |  |
Restructuring Reserve Charged Against Assets |  |  |  |  | 0 | 0 | 0 |  |  |
Restructuring Reserve |  |  | $ 627 |  | 1,294 | 616 | 627 |  | $ 1,294 | $ 1,854
Employee Severance [Member] | Terphane Ltda [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  |  | 0 |  |  |
Employee Severance [Member] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 842 | 822 | 589 |  |  |
Long Lived Asset Impairment [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 882 |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  | 233 | 101,595 |  |  |
Restructuring Reserve Reversed to Income |  |  |  |  |  | (92) |  |  |  |
Payments for Restructuring |  |  |  |  | 0 | 0 | 0 |  |  |
Restructuring Reserve Charged Against Assets |  |  |  |  | (882) | (141) | (101,595) |  |  |
Restructuring Reserve |  |  | 0 |  | 0 | 0 | 0 |  | 0 | 0
Long Lived Asset Impairment [Member] | Terphane Ltda [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  |  | 101,254 |  |  |
Long Lived Asset Impairment [Member] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 595 | 0 | 341 |  |  |
Environmental Exit Costs, Name of Property [Domain] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  |  | 200 |  |  |
Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 826 | 118 |  |  |  |
Restructuring and Related Cost, Incurred Cost |  |  |  |  |  |  | 304 |  |  |
Restructuring Reserve Reversed to Income |  |  |  |  |  | 0 |  |  |  |
Payments for Restructuring |  |  |  |  | (900) |  | (382) |  |  |
Restructuring Reserve Charged Against Assets |  |  |  |  | 0 | 0 | 0 |  |  |
Restructuring Reserve |  |  | 476 |  | 86 | 160 | 476 |  | 86 | 554
Other Restructuring [Member] | Terphane Ltda [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  |  | 0 |  |  |
Other Restructuring [Member] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  | 20 |  |  |  |
Other Restructuring [Member] | Aluminum Extrusions [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  | 304 |  |  |
Long Lived Asset Impairment [Member] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 200 |  |  |  |  |
Other Accrued Expenses [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 4,125 | 3,005 |  |  |  |
Restructuring and Related Cost, Incurred Cost |  |  |  |  |  |  | 102,488 |  |  |
Restructuring Reserve Reversed to Income |  |  |  |  |  | (92) |  |  |  |
Payments for Restructuring |  |  |  |  | (2,639) | (3,099) | (2,198) |  |  |
Restructuring Reserve Charged Against Assets |  |  |  |  | (882) | (141) | (101,595) |  |  |
Restructuring Reserve |  |  | 1,103 |  | 1,380 | 776 | 1,103 |  | 1,380 | $ 2,408
Other Accrued Expenses [Member] | Terphane Ltda [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  |  | 101,254 |  |  |
Other Accrued Expenses [Member] | Aluminum Extrusions [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  | 1,489 | 842 | 1,234 |  |  |
Futura Industries [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset |  |  | $ 700 |  |  |  |  |  |  |
Personal Care Materials [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  | 0 | (46,792) |  |  |  |
Goodwill, Impairment Loss, Net of Tax |  |  |  |  | 38,200 |  |  |  |  |
Personal Care Materials [Member] | Long Lived Asset Impairment [Member] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  | 200 |  |  |
Corporate Segment [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  |  | 0 |  |  |
PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  | 800 |  |  |  |  |
Accelerated Depreciation Expense |  |  |  |  | 1,200 | 600 | 300 |  |  |
Goodwill, Impairment Loss |  |  |  |  | 0 | (46,792) |  |  |  |
PE Films [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  | 800 | 700 | 200 |  |  |
PE Films [Member] | Employee Severance [Member] | Film Products Manufacturing Facility in Shanghai, China |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 113 | 1,832 |  |  |  |
PE Films [Member] | Long Lived Asset Impairment [Member] | Film Products Manufacturing Facility in Shanghai, China |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 0 | 200 |  |  |  |
PE Films [Member] | Other Restructuring [Member] | Film Products Manufacturing Facility in Shanghai, China |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs after Taxes |  |  |  |  |  |  |  |  | 4,100 |
Gain (Loss) on Disposition of Assets |  |  |  | $ 6,300 | 6,316 |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 716 | 98 |  |  |  |
Payments for Restructuring |  |  |  |  | 800 | (434) |  |  | 3,300 |
PE Films [Member] | Other Accrued Expenses [Member] | Film Products Manufacturing Facility in Shanghai, China |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 829 | 2,163 |  |  |  |
Aluminum Extrusions [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  | 0 |  |  |  |  |
Cast House Explosion pretax income/loss |  |  |  |  | 0 | 0 | 5,300 |  |  |
Aluminum Extrusions [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  | 0 | 100 | 100 |  |  |
Flexible packaging films |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on asset impairments |  |  |  |  |  |  | 101,000 |  |  |
Businesss Combination Settlement of Escrow Account |  |  |  |  | 0 | 0 | 11,900 |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  | 1,000 |  |  |  | $ 1,000 |
Asset impairments after taxes |  |  |  |  |  |  | $ 87,000 |  |  |
Assets, Fair Value Disclosure |  |  |  |  |  | $ 30,000 |  |  |  |
Surface Protection Films [Member] | Long Lived Asset Impairment [Member] | PE Films [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 400 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 874 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Employee Severance [Member] | PE Films Personal Care European Operations [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 588 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Long Lived Asset Impairment [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 200 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Long Lived Asset Impairment [Member] | PE Films Personal Care European Operations [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 100 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  | $ 5,100 |  |
Other Restructuring Costs after Taxes |  |  |  |  | 2,700 |  |  |  |  |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  |  |  |  |  | 700 |  |
Severance and other employee-related costs |  |  |  |  |  |  |  | 1,800 |  |
Accelerated Depreciation Expense |  |  |  |  |  |  |  | 1,600 |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  | 7,600 |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 58 |  |  |  |  |
Payments for Restructuring |  |  |  |  | 500 |  |  |  |  |
Projected Proceeds from Future Sale of Assets |  |  |  |  |  |  |  | 5,000 |  |
Personal Care Materials [Member] | PE Films [Member] | Other Restructuring [Member] | PE Films Personal Care European Operations [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs after Taxes |  |  |  |  | 800 |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  | $ 1,700 |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 0 |  |  |  |  |
Payments for Restructuring |  |  |  |  | 500 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Other Restructuring [Member] | PE Films Products Manufacturing Facility Restag Hungary [Domain] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down |  | $ 200 |  |  |  |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Other Restructuring [Member] | Films Products Manufacturing Facility Guangzhou China [Domain] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  | $ 400 |  |  |  |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Other Accrued Expenses [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | 1,123 |  |  |  |  |
Personal Care Materials [Member] | PE Films [Member] | Other Accrued Expenses [Member] | PE Films Personal Care European Operations [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  | $ 684 |  |  |  |  |
[1] | See Notes 1, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.

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