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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Taxes [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income |  |  | $ 2,541,000 | $ 953,000
Effective Income Tax Rate Reconciliation - U.S. Tax on Foreign Branch Income - Percentage |  |  | 4.20% | 52.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  |  | $ (475,000) | $ (318,000)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount |  |  | $ 12,562,000 | $ 383,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent |  |  | (3.60%) | (73.80%)
effective income tax rate reconciliation, valuation allowance due to foreign losses |  |  | $ (2,395,000) | $ 185,000
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 |  |  | $ 1,864,000 | $ 1,159,000
Effective Income Tax Rate Reconciliation Amount - FDII |  |  | (633,000) | (472,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount |  |  | $ (2,157,000) | $ 1,344,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  |  | 3.10% | 63.60%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  |  | $ 633,000 | $ 87,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  |  | 1.10% | 4.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount |  |  | $ (148,000) | $ 173,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent |  |  | (0.20%) | 9.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount |  |  | $ 363,000 | $ 230,000
Effective Income Tax Rate Reconciliation Percent - FDII |  |  | (1.10%) | (25.90%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount |  |  | $ 2,400,000 |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent |  |  | 0.60% | 12.60%
Effective Income Tax Rate Reconciliation Operating Loss Carryforwards Valuation Allowance For Foreign Country |  |  | (4.00%) | 10.10%
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount |  |  | $ 0 | $ 245,000
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance |  |  | 0.00% | 13.40%
Effective Income Tax Rate Reconciliation, Deduction, Amount |  |  | $ 8,424,000 | $ 3,135,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  |  | 0 | 1,788,000
Income Tax Expense (Benefit) | $ (43,000) | $ (6,699,000) | 8,424,000 | 3,135,000
Goodwill, Impairment Loss | 0 | 46,792,000 | $ 0 | $ 46,792,000
Effective Income Tax Rate Reconciliation, Percent |  |  | 14.10% | 172.10%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest | 17,090,000 | $ (40,899,000) | $ 59,819,000 | $ 1,821,000
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent |  |  | (4.20%) | 26.40%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  |  | $ (188,000) | $ (414,000)
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 |  |  | $ 2,100,000 | $ 1,300,000
Terphane Ltda [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Current Effective Tax Rate Including Social Contribution On Income |  |  | 15.25% |
LengthBrazilianTaxIncentive |  |  | 10 years |

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