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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jul. 07, 2015
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | $ 0 | $ (1,100) |
Gain (Loss) on Disposition of Assets |  |  | 0 | 837 |
Harbinger Fund |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Cost-method investment, OTTI | $ 0 | $ 300 | 0 | 600 |
Cost-method investment, OTTI net of tax |  | 200 |  | 400 |
kaleo |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | 0 | (1,100) | 0 | (1,100) |
Unrealized gain (loss) on investment under fair value method, after taxes | 0 | (700) | 0 | (700) |
Corporate [Member] [Domain] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pretax charges for severance and other employee-related costs | 3,900 |  | 3,900 |  |
Film Products |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pretax charges for severance and other employee-related costs | 300 | 600 | 200 | 1,400 |
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Plant shutdown related expenditures |  | 300 |  | 700 |
Pretax charges for severance and other employee-related costs |  | 200 |  | 400 |
Pretax loss for asset impairments |  | 100 |  | 300 |
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Plant shutdown related expenditures | 18 | 24 | 33 | 24 |
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Environmental Exit Costs, Anticipated Cost |  | 200 |  | 200 |
Alleghany and Bath County, Virginia [Member] |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Gain (Loss) on Disposition of Assets | $ 0 | 1,208 | $ 0 | 1,208 |
Gain (Loss) on Sale of Investment Property, After Tax |  | 800 |  |  |
3M vs. Tredegar |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Litigation Settlement, Amount |  | $ 10,000 |  | $ 10,000 |
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
EstimatedLengthOfRestructuringProject |  |  | 21 months |  |
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
EstimatedLengthOfRestructuringProject |  |  | 24 months |  |
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
AcceleratedDepreciationExpectedCost |  |  |  |  | $ 3,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  |  | 2,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
RestructuringExpectedCashOutflows |  |  |  |  | 4,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
RestructuringExpectedCashOutflows |  |  |  |  | 8,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
RestructuringExpectedCashOutflows |  |  |  |  | 1,000
Subsequent Event [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
RestructuringExpectedCashOutflows |  |  |  |  | 1,000
Subsequent Event [Member] | Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  |  | 4,000
RestructuringExpectedCashOutflows |  |  |  |  | 13,000
Subsequent Event [Member] | Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  |  | 2,000
Subsequent Event [Member] | Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  |  | 5,000
RestructuringExpectedCashOutflows |  |  |  |  | 14,000
Subsequent Event [Member] | Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  |  | $ 3,000

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