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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Taxes [Line Items]        
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income     $ 1,808,000 $ 736,000
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage     5.00% 1.70%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount     $ (255,000) $ (188,000)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount     $ 8,972,000 $ 8,971,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent     (3.00%) (1.50%)
effective income tax rate reconciliation, valuation allowance due to foreign losses     $ (1,353,000) $ (383,000)
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     $ 1,191,000 $ 669,000
Effective Income Tax Rate Reconciliation Amount - FDII     (445,000) (309,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount     $ (1,074,000) $ 655,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent     3.30% 1.60%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount     $ 468,000 $ 537,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent     1.10% 1.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount     $ (141,000) $ 176,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent     (0.40%) 0.40%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount     $ 217,000.000 $ 123,000.000
Effective Income Tax Rate Reconciliation Percent - FDII     (1.20%) (0.70%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount     $ (154,000) $ 100,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent     0.60% 0.30%
Effective Income Tax Rate Reconciliation Operating Loss Carryforwards Valuation Allowance For Foreign Country     (3.70%) (0.90%)
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount     $ 0.000 $ 91,000.000
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance     0.00% 0.20%
Effective Income Tax Rate Reconciliation, Deduction, Amount     $ (8,467,000.000) $ (9,834,000.000)
Income Tax Expense (Benefit) $ 4,440,000 $ 4,547,000 $ 8,467,000 $ 9,834,000
Effective Income Tax Rate Reconciliation, Percent     19.80% 23.00%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 18,917,000 $ 19,269,000 $ 42,728,000 $ 42,721,000
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent     (0.40%) 0.20%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount     $ 152,000 $ (34,000)
Income Tax Examination, Interest Accrued $ 200,000   $ 200,000  
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     $ 1,100,000 $ 700,000
Terphane Ltda [Member]        
Income Taxes [Line Items]        
Current Effective Tax Rate Including Social Contribution On Income     15.25%  
LengthBrazilianTaxIncentive     10 years