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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 5,062 | $ 12,718 |  |
Production LIne Start-up and Ramp-up Costs | 1,000 | 1,700 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 23,451 | 6,121 |  |
Business Development Expenses |  | 300 |  |
(Gain)/loss on asset impairments and divestitures | 0 | 50 |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Unrealized gain (loss) on investment under fair value method | 8,200 | 3,300 |  |
Gain (Loss) on Disposition of Assets | 0 | 164 |  |
Payments for Restructuring | 698 |  |  |
Restructuring Reserve | 528 |  |  | $ 1,103
kaleo |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Unrealized gain (loss) on investment under fair value method | 8,200 | 3,300 |  |
Unrealized gain (loss) on investment under fair value method, after taxes | $ 6,400 | 2,500 |  |
Fair Value Inputs, Discount Rate |  |  |  |
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 |  |
PE Films |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Production LIne Start-up and Ramp-up Costs |  | 1,400 |  |
Pretax charges for severance and other employee-related costs | $ 100 |  |  |
Aluminum Extrusions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Production LIne Start-up and Ramp-up Costs |  | 300 |  |
Cast House Explosion pretax income |  | 400 |  |
Insured Event, Gain (Loss) |  | 300 |  |
Loss from Catastrophes |  | 100 |  |
Corporate Segment [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs |  | 300 |  |
Severance (a) |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Payments for Restructuring | 464 |  |  |
Restructuring Reserve | 286 |  |  | $ 627
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] | Aluminum Extrusions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Professional Fees | 300 |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Environmental Exit Costs, Anticipated Cost |  | 300 |  |
FilmProductsManufacturingFacilityInLakeZurichIllinois [Member] | Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Plant Shutdown Related Expenditures Gross |  | 700 |  |
Pretax charges for severance and other employee-related costs |  | 200 |  |
(Gain)/loss on asset impairments and divestitures |  | 100 |  |
Accelerated Depreciation Expense |  | 100 |  |
Other Restructuring Costs |  | 300 |  |
Other Plant Consolidation Expenses - Cost of Goods Sold |  | $ 200 |  |
Pension Plan [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year | $ 8,400 |  |  |

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