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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 156 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 30, 2027
Income Taxes [Line Items]            
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income       $ 656,000 $ 3,034,000  
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage       (2.10%) 4.50%  
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount       $ (612,000) $ (336,000)  
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount       $ (6,639,000) $ 14,284,000  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent       10.80% (3.60%)  
effective income tax rate reconciliation, valuation allowance due to foreign losses       $ 0 $ (2,074,000)  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       21.00% 21.00%  
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount       $ 2,772,000 $ 1,513,000  
Effective Income Tax Rate Reconciliation Amount - FDII       0 (546,000)  
Effective Income Tax Rate Reconciliation, Tax Credit, Amount       $ (3,412,000) $ 2,416,000  
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent       (8.80%) 2.20%  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount       $ (537,000) $ 560,000  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent       1.70% 0.80%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount       $ 240,000 $ (132,000)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent       (0.80%) (0.20%)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount       $ 312,000 $ 242,000  
Effective Income Tax Rate Reconciliation Percent - FDII       0.00% (0.80%)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent       (1.00%) 0.40%  
Effective Income Tax Rate Reconciliation Operating Loss Carryforwards Valuation Allowance For Foreign Country       0.00% (3.00%)  
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount       $ 61,000 $ 0  
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance       (0.20%) 0.00%  
Effective Income Tax Rate Reconciliation, Deduction, Amount       $ (8,308,000) $ 10,550,000  
Goodwill, Impairment Loss $ 0 $ 13,700,000 $ 0 $ 13,696,000 $ 0  
Effective Income Tax Rate Reconciliation, Percent       26.20% 15.50%  
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest (22,918,000)   15,229,000 $ (31,616,000) $ 68,021,000  
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent       0.50% (3.70%)  
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount       $ (1,001,000) $ (36,000)  
Income Tax Expense (Benefit) $ (5,942,000)   $ 177,000 $ (8,308,000) 10,550,000  
Brazilian [Member]            
Income Taxes [Line Items]            
Effective income tax rate reconciliation social contribution on income       9.00%    
Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Excluding Social Contribution On Income       25.00%    
Effective Income Tax Rate Reconciliation Federal Statutory Tax Rate Including Social Contribution On Income       34.00%    
Flexible Packaging Films [Member]            
Income Taxes [Line Items]            
Foreign Tax Credit - Brazil       $ 3,400,000 $ 2,400,000  
Terphane Ltda [Member]            
Income Taxes [Line Items]            
Current Effective Tax Rate Including Social Contribution On Income       15.25%    
LengthBrazilianTaxIncentive           13 years