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Losses Associated With Plant Shutdowns, Asset Impairments And Restructurings, Unusual Items, Gains From Sale Of Assets And Other Items Shanghai Plant Shutdown (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2019 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  | $ 3,099 | $ 2,198 | $ 1,540 |  |
Severance Costs |  |  |  |  |  |  |  | $ 300 |  |  |  |  |
Severance Costs After Taxes |  |  |  |  |  |  |  | 200 |  |  |  |  |
Loss on asset impairments |  |  |  |  |  |  |  |  | 223 | $ 101,282 | $ 1,436 |  |
PE Films [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Severance Costs | $ 300 | $ 300 |  | $ 100 | $ 100 | $ 100 |  | 100 |  |  |  |  |
Severance Costs After Taxes | 300 | 200 |  | 100 | 100 | $ 100 |  | $ 100 |  |  |  |  |
Loss on asset impairments |  |  |  |  | 0 |  | $ 200 |  |  |  |  |  |
Asset Impairment Charges After Taxes |  |  |  |  | $ 300 |  | $ 100 |  |  |  |  |  |
Other Restructuring [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Severance Costs | 500 | 1,300 | $ 400 | 0 |  |  |  |  | 2,200 |  |  |  |
Severance Costs After Taxes | 500 | 1,300 | 400 | 0 |  |  |  |  | 2,200 |  |  |  |
Accelerated Depreciation Expense | 100 | 400 | 100 | 0 |  |  |  |  | 600 |  |  |  |
Accelerated Depreciation Expense taxes | 100 | 400 | 100 | 0 |  |  |  |  | 600 |  |  |  |
Other Restructuring Costs | 300 | 100 | 100 | 0 |  |  |  |  | 500 |  |  |  |
Other Restructuring Costs after Taxes | 300 | 100 | 100 | 0 |  |  |  |  | 500 |  |  |  |
Plant Shutdown Related Expenditures Net | 900 | 1,800 | 600 | 0 |  |  |  |  | 3,300 |  |  |  |
Plant Shutdown Related Expenditures Net, net of taxes | 900 | 1,800 | 600 | 0 |  |  |  |  | 3,300 |  |  |  |
Other Plant Consolidation Expenses - Cost of Goods Sold | 300 | 700 | 200 | 0 |  |  |  |  | 1,200 |  |  |  |
Other Plant Consolidation Expenses - Cost of Goods Sold, Net of Taxes | $ 300 | $ 700 | $ 200 | $ 0 |  |  |  |  | 1,200 |  |  |  |
Other Restructuring [Member] | PE Films [Member] | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 | $ 7,100
Asset Impairment And Costs Associated With Exit And Disposal Activities - impairment Line |  |  |  |  |  |  |  |  | 2,100 |  |  |  |
Asset Impairment And Costs Associated With Exit And Disposal Activities - Cost of Goods Sold |  |  |  |  |  |  |  |  | 1,200 |  |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  | $ 2,500 |  |  |  |
Severance Costs |  |  |  |  |  |  |  |  |  |  |  |  | 2,900
Accelerated Depreciation Expense |  |  |  |  |  |  |  |  |  |  |  | $ 600 | 900
Restructuring and Disposal Activities - Anticipated Cash Cost Savings |  |  |  |  |  |  |  |  |  |  |  |  | 1,700
Other Restructuring Costs |  |  |  |  |  |  |  |  |  |  |  |  | 1,600
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  |  |  |  |  |  |  |  |  |  | $ 500

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