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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

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