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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2016 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | $ 9,379,000 | $ (33,341,000) | $ 24,602,000 | $ (17,195,000) |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  |  | 5,700,000 |  |  |
Business Development Expenses |  |  | 400,000 |  |  |
Pretax charges for severance and other employee-related costs | 300,000 | 900,000 | 300,000 | 1,100,000 |  |
Loss on asset impairments and divestitures |  |  | 412,000 | 319,000 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | (200,000) | 0 |  |
Gain (Loss) on Disposition of Assets |  |  | 0 | (11,000) |  |
Payments for Restructuring |  |  | 1,426,000 |  |  |
Goodwill, Impairment Loss | 0 | 44,465,000 | 0 | 44,465,000 |  |
kaleo |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | (1,300,000) | 0 | (200,000) | 0 |  |
Unrealized gain (loss) on investment under fair value method, after taxes | (1,000,000) |  | (200,000) |  |  |
Corporate [Member] [Domain] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  | 3,900,000 |  |
PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pretax charges for severance and other employee-related costs | 100,000 | 900,000 | 100,000 | 900,000 |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  | 200,000 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Goodwill, Impairment Loss | 0 | 44,465,000 | 0 | 44,465,000 |  |
Aluminum Extrusions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cast House Explosion pretax income | 1,700,000 |  | 1,100,000 |  |  |
Insured Event, Gain (Loss) | 1,900,000 |  | 1,900,000 |  |  |
Tangible Asset Impairment Charges | 300,000 |  | 300,000 |  |  |
Loss from Catastrophes | 50,000 |  | 500,000 |  |  |
Pretax charges for severance and other employee-related costs |  | 35,000 |  | 35,000 |  |
Corporate Segment [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pretax charges for severance and other employee-related costs | 200,000 | 26,000 | 200,000 | 26,000 |  |
Severance |  |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Payments for Restructuring |  |  | 833,000 |  |  |
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plant shutdown related expenditures |  | 300,000 |  | 300,000 |  |
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing | Aluminum Extrusions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plant shutdown related expenditures | 300,000 |  | 300,000 |  |  |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
AcceleratedDepreciationExpectedCost | 3,000,000 |  | 3,000,000 |  |  | $ 3,000,000
Other Plant Consolidation Expenses - Cost of Goods Sold | 500,000 |  | 1,800,000 |  |  |
Pretax loss for asset impairments | 600,000 |  | 1,800,000 |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |  |
Payments for Restructuring | 3,200,000 |  | 9,000,000 |  |  | 12,500,000
Capital Expenditures Restructuring Project | 2,600,000 |  | 7,100,000 |  |  | 10,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Plant shutdown related expenditures | 1,100,000 | 1,200,000 | 3,600,000 | 1,200,000 |  | 5,700,000
Pretax charges for severance and other employee-related costs | 300,000 | 300,000 | 900,000 | 300,000 |  |
Loss on asset impairments and divestitures | 100,000 | 300,000 | 400,000 | 300,000 |  |
Accelerated Depreciation Expense | 100,000 | 200,000 | 400,000 | 200,000 |  |
Other Restructuring Costs | 600,000 | $ 300,000 | 1,900,000 | 300,000 |  |
Other Plant Consolidation Expenses - Cost of Goods Sold | 400,000 |  | 1,400,000 | $ 46,000 |  |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,000,000 |  | 2,000,000 |  |  | 2,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
RestructuringExpectedCashOutflows | 5,000,000 |  | 5,000,000 |  |  | 5,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
RestructuringExpectedCashOutflows | 11,000,000 |  | 11,000,000 |  |  | 11,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
RestructuringExpectedCashOutflows | 1,000,000 |  | 1,000,000 |  |  | 1,000,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
RestructuringExpectedCashOutflows | 1,000,000 |  | 1,000,000 |  |  | 1,000,000
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 5,000,000 |  | 5,000,000 |  |  | 5,000,000
RestructuringExpectedCashOutflows | 16,000,000 |  | 16,000,000 |  |  | 16,000,000
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,000,000 |  | 2,000,000 |  |  | 2,000,000
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 6,000,000 |  | 6,000,000 |  |  | 6,000,000
RestructuringExpectedCashOutflows | 17,000,000 |  | 17,000,000 |  |  | 17,000,000
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance | PE Films |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 3,000,000 |  | $ 3,000,000 |  |  | $ 3,000,000
Pension Plan [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year |  |  |  |  | $ 7,700,000 |

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