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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs | $ 900,000 | $ 400,000 | $ 1,100,000 | $ 1,800,000
Loss on asset impairments and divestitures |  |  | 319,000 | 993,000
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | 0 | 2,900,000
Gain (Loss) on Disposition of Assets |  |  | 11,000 | 919,000
Harbinger Fund |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Cost-method investment, OTTI | 0 | 200,000 | 0 | 800,000
Cost-method investment, OTTI net of tax |  | 100,000 |  | 500,000
kaleo |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Unrealized gain (loss) on investment under fair value method | 0 | 4,000,000 | 0 | 2,900,000
Unrealized gain (loss) on investment under fair value method, after taxes | 0 | 2,500,000 | 0 | 1,800,000
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 | 900,000 | 100,000 | 900,000 | 1,500,000
Flexible Packaging Films [Member] [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs |  | 300,000 | 200,000 | 300,000
Aluminum Extrusions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs | 35,000 | 31,000 | 35,000 | 31,000
Corporate Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs | 26,000 |  | 26,000 |
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Plant shutdown related expenditures |  | 37,000 |  | 800,000
Pretax charges for severance and other employee-related costs |  |  |  | 500,000
Pretax loss for asset impairments |  |  |  | 300,000
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Plant shutdown related expenditures | 300,000 | 20,000 | 300,000 | 43,000
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Environmental Remediation Expense |  | 75,000 |  | 200,000
Alleghany and Bath County, Virginia [Member] |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Gain (Loss) on Disposition of Assets | 0 | $ 0 | 0 | 1,208,000
Gain (Loss) on Sale of Investment Property, After Tax |  |  |  | 800,000
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
AcceleratedDepreciationExpectedCost | 3,000,000 |  | 3,000,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,000,000 |  | 2,000,000 |
Plant shutdown related expenditures | 1,200,000 |  | 1,200,000 |
Pretax charges for severance and other employee-related costs | 300,000 |  | 300,000 |
Loss on asset impairments and divestitures | 300,000 |  | 300,000 |
Accelerated Depreciation Expense | 200,000 |  | 200,000 |
Other Restructuring Costs | 300,000 |  | 300,000 |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  | 46,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
RestructuringExpectedCashOutflows | 4,000,000 |  | 4,000,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
RestructuringExpectedCashOutflows | 8,000,000 |  | 8,000,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
RestructuringExpectedCashOutflows | 1,000,000 |  | 1,000,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
RestructuringExpectedCashOutflows | 1,000,000 |  | $ 1,000,000 |
3M vs. Tredegar |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Litigation Settlement, Amount |  |  |  | $ 10,000,000
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
EstimatedLengthOfRestructuringProject |  |  | 21 months |
Restructuring and Related Cost, Expected Cost | 4,000,000 |  | $ 4,000,000 |
RestructuringExpectedCashOutflows | 13,000,000 |  | 13,000,000 |
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | 2,000,000 |  | $ 2,000,000 |
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
EstimatedLengthOfRestructuringProject |  |  | 24 months |
Restructuring and Related Cost, Expected Cost | 5,000,000 |  | $ 5,000,000 |
RestructuringExpectedCashOutflows | 14,000,000 |  | 14,000,000 |
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 3,000,000 |  | $ 3,000,000 |

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