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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 10 Months Ended 19 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 975,904 313,834      
Payments to Acquire Property, Plant, and Equipment $ 12,879 $ 5,062      
Asset impairments and costs associated with exit and disposal activities, net of adjustments 1,056 123      
Income before income taxes 23,811 23,451      
(Gain)/loss on asset impairments and divestitures 421 0      
Other Non-Operating and Non-Recurring Charges [Abstract]          
Unrealized gain (loss) on investment under fair value method (17,082) (8,200)      
Gain (Loss) on Disposition of Assets (385) 0      
Payments for Restructuring 468        
Restructuring Reserve 960   $ 960   $ 776
kaleo          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Unrealized gain (loss) on investment under fair value method (17,082) (8,200)      
Unrealized gain (loss) on investment under fair value method, after taxes 14,300 6,400      
Other Interest and Dividend Income 17,582        
Terphane Ltda [Member]          
Restructuring Cost and Reserve [Line Items]          
Professional Fees   300      
PE Films          
Restructuring Cost and Reserve [Line Items]          
Production LIne Start-up and Ramp-up Costs 300        
Pretax charges for severance and other employee-related costs 400 100      
Other Non-Operating and Non-Recurring Charges [Abstract]          
Plant shutdowns, asset impairments, restructurings and other (1,378) (1,052)      
Flexible Packaging Films [Member] [Domain]          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Plant shutdowns, asset impairments, restructurings and other 0 0      
Aluminum Extrusions          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Plant shutdowns, asset impairments, restructurings and other (40) (53)      
Corporate Segment [Member]          
Restructuring Cost and Reserve [Line Items]          
Professional Fees 900        
Severance (a)          
Other Non-Operating and Non-Recurring Charges [Abstract]          
Payments for Restructuring 242        
Restructuring Reserve 829   829   $ 616
Film Products Manufacturing Facility In Shanghai, China [Member]          
Restructuring Cost and Reserve [Line Items]          
Property, Plant and Equipment, Disposals 400        
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Other Restructuring Costs after Taxes 200 $ 1,000 3,500    
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] | PE Films          
Restructuring Cost and Reserve [Line Items]          
Pretax charges for severance and other employee-related costs       $ 2,900  
Accelerated Depreciation Expense       600  
Restructuring and Disposal Activities - Anticipated Cash Cost Savings       1,700  
Other Restructuring Costs       1,600  
Other Plant Consolidation Expenses - Cost of Goods Sold       500  
Other Non-Operating and Non-Recurring Charges [Abstract]          
Restructuring, Settlement and Impairment Provisions       $ 5,000  
Payments for Restructuring 200   $ 2,700    
Pension Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year $ 8,100