Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 24 Months Ended |
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2017 |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Payments to Acquire Property, Plant, and Equipment | | | $ 26,692 | $ 19,018 | | |
Production LIne Start-up and Ramp-up Costs | $ 1,000 | | 2,800 | | | |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 47,031 | $ 4,725 | 53,152 | 15,223 | | |
Business Development Expenses | 600 | | 900 | 400 | | |
Pretax charges for severance and other employee-related costs | | | 300 | | | |
(Gain)/loss on asset impairments and divestitures | | | 50 | 339 | | |
Other Non-Operating and Non-Recurring Charges [Abstract] | | | | | | |
Unrealized gain (loss) on investment under fair value method | | | 24,800 | 1,100 | | |
Gain (Loss) on Disposition of Assets | | | 307 | 0 | | |
Payments for Restructuring | | | 558 | | | |
kaleo | | | | | | |
Other Non-Operating and Non-Recurring Charges [Abstract] | | | | | | |
Unrealized gain (loss) on investment under fair value method | 21,500 | 300 | 24,800 | 1,100 | | |
Unrealized gain (loss) on investment under fair value method, after taxes | 15,700 | 200 | $ 18,200 | 800 | | |
Fair Value Inputs, Discount Rate | | | 45.00% | | 45.00% | |
Futura Industries [Member] | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Net Business Combination Acquisition, Integration Costs and Other Related Costs | | | $ 3,300 | | | |
Business Combination, Inventory FV Adj | | | 1,700 | | | |
Business Combination, Acquisition Related Costs | | | 1,500 | | | |
Business Combination, Integration Related Costs | | | 100 | | | |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset | (700) | | (700) | | | |
Futura Industries [Member] | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Payments to Acquire Property, Plant, and Equipment | 500 | | 900 | | | |
Flexible Packaging Films [Member] | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Businesss Combination Settlement of Escrow Account | (11,900) | | | | | |
Loss Contingency, Estimate of Possible Loss | 3,500 | | 3,500 | | | $ 3,500 |
Foreign Income Tax Expense (Benefit), Continuing Operations | 400 | | | | | |
PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Production LIne Start-up and Ramp-up Costs | 900 | | 2,400 | | | |
Aluminum Extrusions | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Production LIne Start-up and Ramp-up Costs | 100 | | 400 | | | |
Cast House Explosion pretax income | 900 | (600) | 500 | (600) | | |
Excess production costs for which recovery from insurance is not assured | 300 | | | | $ 600 | |
Insured Event, Gain (Loss) | | | 600 | | | |
Loss from Catastrophes | | | 100 | | | |
Severance | | | | | | |
Other Non-Operating and Non-Recurring Charges [Abstract] | | | | | | |
Payments for Restructuring | | | 482 | | | |
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] | Aluminum Extrusions | | | | | | |
Other Non-Operating and Non-Recurring Charges [Abstract] | | | | | | |
Environmental Exit Costs, Anticipated Cost | | | 300 | | | |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films | | | | | | |
Other Non-Operating and Non-Recurring Charges [Abstract] | | | | | | |
Payments for Restructuring | | | 500 | | | 14,400 |
Capital Expenditures Restructuring Project | | | 100 | | | 11,200 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Plant Shutdown Related Expenditures Gross | 300 | | 700 | | | |
Plant shutdown related expenditures | | 1,400 | 600 | 2,500 | | 7,100 |
Pretax charges for severance and other employee-related costs | 300 | 400 | 100 | 700 | | |
(Gain)/loss on asset impairments and divestitures | | 100 | 100 | 300 | | |
Accelerated Depreciation Expense | 100 | 100 | 200 | 200 | | |
Other Restructuring Costs | 200 | 800 | 400 | 1,300 | | |
Other Plant Consolidation Expenses - Cost of Goods Sold | | $ 700 | 300 | $ 1,100 | | |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSeverance&EquipmentTransfers [Member] | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
RestructuringExpectedCashOutflows | 5,000 | | 5,000 | | | 5,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringCapExEquiptUpgrades [Member] | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
RestructuringExpectedCashOutflows | 11,000 | | 11,000 | | | 11,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringSafetyQualityIncentives [Member] | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
RestructuringExpectedCashOutflows | 1,000 | | 1,000 | | | 1,000 |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | RestructuringProductQualifications [Member] | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
RestructuringExpectedCashOutflows | 1,000 | | 1,000 | | | 1,000 |
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Restructuring and Related Cost, Expected Cost | 5,000 | | 5,000 | | | 5,000 |
RestructuringExpectedCashOutflows | 17,000 | | 17,000 | | | 17,000 |
Minimum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Restructuring and Related Cost, Expected Cost | 2,000 | | 2,000 | | | 2,000 |
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Restructuring and Related Cost, Expected Cost | 6,000 | | 6,000 | | | 6,000 |
RestructuringExpectedCashOutflows | 17,000 | | 17,000 | | | 17,000 |
Maximum | FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Severance | PE Films | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Restructuring and Related Cost, Expected Cost | $ 3,000 | | 3,000 | | | $ 3,000 |
Pension Plan [Member] | | | | | | |
Restructuring Cost and Reserve [Line Items] | | | | | | |
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year | | | $ 6,000 | | | |