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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (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 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 178,676 | 479,651 | 236,138 | 386,729 |  |
Payments to Acquire Property, Plant, and Equipment |  |  | $ 25,078 | $ 37,245 |  |
Production LIne Start-up and Ramp-up Costs | $ 200 | $ 700 | 1,700 | 3,500 |  |
Asset impairments and costs associated with exit and disposal activities, net of adjustments | 1,209 | 361 | 1,799 | 653 |  |
Income (loss) before income taxes | (40,899) | 12,696 | 1,821 | 65,847 |  |
(Gain)/loss on asset impairments and divestitures |  |  | 185 | 50 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | 11,900 | 24,800 |  |
Cost-method investment, OTTI | 186 | 0 | 186 |  |  |
Gain (Loss) on Disposition of Assets |  |  | (86) | 412 |  |
Payments for Restructuring |  |  | 1,243 |  |  |
Goodwill, Impairment Loss | 46,792 | 0 | 46,792 | 0 |  |
Restructuring Reserve | 1,751 |  | 1,751 |  |  | $ 1,103
kaleo |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | (2,100) | 0 | 11,900 | 24,800 |  |
Unrealized gain (loss) on investment under fair value method, after taxes | (1,600) |  | 9,300 | 18,200 |  |
Futura Industries [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net Business Combination Acquisition, Integration Costs and Other Related Costs |  |  |  | 3,300 |  |
Business Combination, Inventory FV Adj |  |  |  | 1,700 |  |
Business Combination, Acquisition Related Costs |  |  |  | 1,500 |  |
Business Combination, Integration Related Costs |  |  |  | 100 |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset |  |  |  | (700) |  |
Terphane Ltda [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Professional Fees | 400 |  | 700 |  |  |
Aluminum Extrusions Manufacturing Facility In Carthage Tennessee [Member] [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Environmental Remediation Expense | 200 |  | 200 |  |  |
Elkhart Plant Roof Damage - SGA | 100 |  | 100 |  |  |
Harbinger Capital Partners Special Situations Fund L P [Member] |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Cost-method investment, OTTI | 200 |  | 300 |  |  |
Flexible Packaging Films [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Businesss Combination Settlement of Escrow Account | 0 | 0 | 0 | (11,900) |  |
Loss Contingency, Estimate of Possible Loss | 1,000 |  | 1,000 |  |  |
Corporate [Member] [Domain] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  | 300 |  |
PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Production LIne Start-up and Ramp-up Costs |  | 600 |  | 3,000 |  |
Pretax charges for severance and other employee-related costs | 200 | 100 | 300 | 100 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | (2,355) | (919) | (4,542) | (3,890) |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | 0 | 0 | 0 | 11,856 |  |
Aluminum Extrusions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Production LIne Start-up and Ramp-up Costs |  | 100 |  | 500 |  |
Cast House Explosion pretax income |  |  |  | 500 |  |
Cast House Explosion Excess Production Costs |  |  |  | 600 |  |
Loss from Catastrophes |  |  |  | 100 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | (297) | (377) | (396) | (3,147) |  |
Corporate Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  | 400 |  |
Severance (a) |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Payments for Restructuring |  |  | 933 |  |  |
Restructuring Reserve | 1,565 |  | 1,565 |  |  | $ 627
Personal Care Materials [Member] | PE Films |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Goodwill, Impairment Loss | 46,800 |  |  |  |  |
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing | Aluminum Extrusions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plant shutdown related expenditures |  | 200 |  | 200 |  |
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset Impairment And Costs Associated With Exit And Disposal Activities | 1,700 |  | 2,400 |  |  |
Asset impairments and costs associated with exit and disposal activities, net of adjustments | 1,000 |  | 1,500 |  |  |
Asset Impairment And Costs Associated With Exit And Disposal Activities - Cost of Goods Sold | 700 |  | 900 |  |  |
Plant Shutdown Related Expenditures Gross |  |  | 200 |  |  |
Pretax charges for severance and other employee-related costs | 1,300 |  | 1,700 |  | $ 3,600 |
Accelerated Depreciation Expense | 400 |  | 500 |  | 900 |
Restructuring and Disposal Activities - Anticipated Cash Cost Savings |  |  |  |  | 1,700 |
Other Restructuring Costs |  |  |  |  | 2,400 |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  |  | 1,100 |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  | $ 7,100 |
Payments for Restructuring | 100 |  |  |  |  |
Restructuring and Related Cost, Accelerated Depreciation |  |  | 400 |  |  |
Aluminum Extrusions Manufacturing Facility In Carthage Tennessee [Member] [Member] | Aluminum Extrusions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Business Development Expenses |  | 200 |  | 1,100 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Environmental Exit Costs, Anticipated Cost |  |  |  | 400 |  |
Alleghany and Bath County, Virginia [Member] |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Cost-method investment, OTTI |  |  |  | 0 |  |
Impairment of Real Estate | $ 200 |  |  |  |  |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Tangible Asset Impairment Charges |  |  |  | 100 |  |
Restructuring Costs and Asset Impairment Charges |  | $ 200 |  | 800 |  |
Pretax charges for severance and other employee-related costs |  |  |  | 100 |  |
Accelerated Depreciation Expense |  |  |  | 200 |  |
Other Restructuring Costs |  |  |  | $ 500 |  |
Pension Plan [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year |  |  | $ 8,400 |  |  |

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