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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) employee | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  | $ 1,100 | $ 900 | $ 300 |  | $ 500 | $ 400 |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 403 | $ 993 | $ 1,639
Severance and other employee-related costs after taxes |  | 700 | 600 | 200 |  | 300 | 200 |  |  |  |  |  |  |  |  |
Business Development Expenses |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Development Expenses Net Of Tax |  | 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments under fair value method |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,500) | 2,000 | 3,400
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other |  |  |  |  |  |  |  |  | $ 13,800 |  |  |  |  | 10,100 | 3,400 |
Losses Associated with Plant Shutdowns, Asset Impairments, Restructurings & Other After Taxes |  |  |  |  |  |  |  |  | 9,300 |  |  |  |  | 6,400 | 2,200 |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,027 | 3,039 | 1,434
kaleo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments under fair value method | [1] |  |  |  |  |  |  |  |  |  |  |  |  | (20,500) | 2,000 | 3,400
Unrealized gain (loss) on investments, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,700) | 1,000 | 2,200
Harbinger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on investments under fair value method, other than temporary impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800 | 400
Unrealized loss on investments under fair value method, other than temporary impairment, after taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 | 300
Alleghany and Bath County, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,208 | 0
Unrealized Gain (Loss) on Investment Property |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (1,018)
Unrealized Gain Loss On Investment Property After Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (600)
Gain (Loss) on Sale of Investment Property, After Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800 |
PE Films [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |
Severance and other employee-related costs after taxes |  |  |  |  |  |  |  |  |  |  |  |  | 67 |  |  |
Aluminum Extrusions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |
Severance and other employee-related costs after taxes |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  | 3,900 |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs after taxes |  |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  | 300 | $ (100) |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs after taxes |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
PE Films [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  | 900 | 0 |  | 200 | 100 | $ 600 | 800 |  |  |  |  |  |  |
Severance and other employee-related costs after taxes |  |  |  |  |  |  |  | 400 | 500 |  |  |  |  |  |  |
PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AcceleratedDepreciationExpectedCost |  | 3,000 |  |  |  |  |  |  |  |  |  |  |  | 3,000 |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100 |  |
Capital Expenditures Restructuring Project |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 |  |
PE Films [Member] | Film Products Manufacturing Facility in Shanghai, China |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of equipment |  |  |  |  |  |  |  |  |  |  |  | $ (91) |  |  |  |
Gain (Loss) on Disposition of Property, Plant, and Equipment, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | (91) |  |  |  |
PE Films [Member] | Film Products Manufacturing Facility in LaGrange, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of equipment |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property, Plant, and Equipment, Net of Tax |  |  |  |  |  | 73 |  |  |  |  |  |  |  |  |  |
PE Films [Member] | RestructuringProductQualifications [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RestructuringExpectedCashOutflows |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |
PE Films [Member] | Facility Closing | Film Products Manufacturing Facility in Red Springs, NC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant shutdown related expenditures |  |  |  |  |  | 100 | (37) | (300) | (500) | (300) | $ (200) |  |  | (700) | $ (500) |
Plant shutdown related expenditures after taxes |  |  |  |  |  | 63 | (23) | (200) | (300) | (200) | (83) |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  |  |  |  |  | 300 |  |  |  | 400 |  |
Asset Impairment and Other Plant Shutdown Related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |
Number of employees employed | employee |  | 66 |  |  |  |  |  |  |  |  |  |  |  | 66 |  |
PE Films [Member] | Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Restructuring Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |
Restructuring and Related Cost, Expected Cost |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |
Plant shutdown related expenditures |  | (1,000) | (1,200) |  |  |  |  |  |  |  |  |  |  |  |  |
Plant shutdown related expenditures after taxes |  | (600) | (700) |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 800 |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |
Accelerated Depreciation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |
PE Films [Member] | RestructuringSeverance&EquipmentTransfers [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RestructuringExpectedCashOutflows |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |
PE Films [Member] | RestructuringCapExEquiptUpgrades [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RestructuringExpectedCashOutflows |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |
PE Films [Member] | Tredegar vs. 3M [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |
Litigation Settlement Amount, Net of Tax |  |  |  |  |  |  |  |  | $ 6,800 |  |  |  |  |  |  |
Aluminum Extrusions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  | 35 |  |  |  | 0 |  |  |  |  |  |  |  |  |
Aluminum Extrusions | Aluminum Extrusions Manufacturing Facility In Newnan Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future environmental costs |  | 300 |  |  |  | 700 | 75 | 200 |  | 1,500 | 100 | 85 |  |  |  |
Expected future environmental costs after taxes |  | 200 |  |  |  | 400 | 46 | 100 |  | $ 900 | 62 | 53 |  |  |  |
Aluminum Extrusions | Facility Closing | Aluminum Extrusions Manufacturing Facility In Kentland, Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant shutdown related expenditures |  | (31) | (300) | (18) | (15) | (11) | (20) | (24) |  |  | (45) | (400) | (200) |  |  |
Plant shutdown related expenditures after taxes |  | (19) | $ (200) | $ (11) | $ (9) | (7) | (12) | $ (15) |  |  | $ (28) | (200) | (94) |  |  |
Aluminum Extrusions | AACOA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration-related expenses and other non-recurring transactions |  |  |  |  |  |  |  |  |  |  |  | 90 | 100 |  |  |
Integration-related expenses and other non-recurring transactions after taxes |  |  |  |  |  |  |  |  |  |  |  | $ 54 | $ 63 |  |  |
Flexible packaging films |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  |  |  |  |  | $ 300 | $ 300 |  |  |  |  |  |  |  |  |
Minimum | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  |
RestructuringExpectedCashOutflows |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  | 15,000 |  |
Restructuring Future Annual Cost Savings |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |
Minimum | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |
Maximum | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |
RestructuringExpectedCashOutflows |  | 16,000 |  |  |  |  |  |  |  |  |  |  |  | 16,000 |  |
Restructuring Future Annual Cost Savings |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  | 6,000 |  |
Maximum | PE Films [Member] | Employee Severance [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 3,000 |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and other employee-related costs |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | See Notes 1, 3, 4 and 18 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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