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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