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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (14.90%) 1.90% 2.10%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.50% 1.50% 1.50%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent 9.90% (0.20%) (0.50%)
Changes in estimates related to prior year tax provision $ (2,472) $ (135) $ (380)
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount 52 60 553
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount $ 13 $ 60 $ 126
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent (0.90%) 0.40% 0.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount $ 219 $ 285 $ 99
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent 0.20% (3.50%) 0.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Valuation allowance $ 17,485 $ 3,787 $ 15,800
Balance of unrecognized state tax positions 500    
Income tax expense (benefit) at federal statutory rate $ (5,260) $ 15,121 $ 16,878
Unremitted earnings from foreign operations (0.10%) 0.10% 0.20%
State taxes, net of federal income tax benefit $ (373) $ 1,050 $ 1,203
Foreign rate differences $ 3,753 $ 1,533 $ 1,576
Valuation allowance due to foreign losses and impairments 0.00% (19.90%) (2.70%)
Income tax expense (benefit) at effective income tax rate $ (8,213) $ 13,545 $ 18,807
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 4,900 12,400  
State And Foreign Net Operating Loss Carryforwards      
Income Taxes [Line Items]      
Operating Loss Carryforwards 18,300 18,000  
Valuation allowance 5,500 2,500 6,600
Excess Capital Losses From Investments And Other Related Items      
Income Taxes [Line Items]      
Valuation allowance $ 1,300 7,100 1,200
Terphane Ltda [Member]      
Income Taxes [Line Items]      
Income tax rate 6.25%    
Current effective tax rate 15.25%    
Percentage of social contribution on income included in current effective tax rate 9.00%    
Brazilian      
Income Taxes [Line Items]      
Federal statutory income tax rate 34.00%    
Income tax rate 25.00%    
Percentage of social contribution on income included in federal statutory income tax rate 9.00%    
Maximum      
Income Taxes [Line Items]      
Net Operating Loss Carrforward Expiration Period 20 years    
Flexible Packaging Films [Member]      
Income Taxes [Line Items]      
Foreign Tax Credit - Brazil $ 4,800 $ 2,000 $ 1,300