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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 31.70% | 356.50% | 11.60%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  |  |  | 5.00% | (17.10%) | 1.80%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  |  |  | 1.40% | (4.40%) | 2.30%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  |  |  | (0.80%) | (2.10%) | 1.20%
Changes in estimates related to prior year tax provision |  |  |  | $ (303) | $ 320 | $ 330
Effective Income Tax Rate Reconciliation Capital Loss Carryforwards Valuation Allowance, Amount |  |  |  | $ 553.000 | $ 83.000 | $ 267.000
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent |  |  |  | 0.00% | 0.00% | (23.70%)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent |  |  |  | 0.00% | 0.00% | (2.70%)
Effective Income Tax Rate Reconciliation Unremitted Earnings From Foreign Operations, Amount |  |  |  | $ 126.000 | $ 0.000 | $ (256.000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent |  |  |  | 0.90% | (2.90%) | 1.40%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount |  |  |  | $ 322.000 | $ 434.000 | $ 396.000
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent |  |  |  | 2.10% | 2.80% | 0.40%
Increase In Value Of kaléo Investment Held Abroad, Percentage |  |  |  | 0.00% | 15.60% | (0.70%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  | 0.00% | 29.70% | 0.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% | 35.00% | 35.00%
Effective Tax Rate Reconciliation Worthless Stock Deductions, Amount |  |  |  | $ 0.000 | $ (61,413.000) | $ 0.000
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  | 0.00% | 411.90% | 0.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  | $ 3,900,000 |
Foreign Income Tax Expense (Benefit), Continuing Operations |  |  |  | $ 13,300,000 |  |
Deferred Tax Benefit Expense Valuation Allowance Adj Capital Loss Carryforwards |  |  |  | 0 |  |
excess foreign tax credits repatriation |  |  |  | 6,400,000 |  |
Valuation allowance | $ 24,736,000 |  |  | 24,736,000 | 28,499,000 |
Balance of unrecognized state tax positions | 3,200,000 |  |  | 3,200,000 |  |
Income tax expense (benefit) at federal statutory rate |  |  |  | 7,638 | (5,219) | $ 9,689
Impact of U.S. Tax Cuts and Jobs Act |  |  |  | 0 | $ (4,433) | 0
Effective Tax Rate Reconciliation, Escrow Settlement |  |  |  |  | 28.20% |
Increase in value of kaléo investment held abroad |  |  |  | $ 0 | $ (2,326) | $ (197)
Unremitted earnings from foreign operations |  |  |  | 0.30% | 0.00% | (0.90%)
Domestic Production Activities Deduction |  |  |  | $ 0 | $ 0 | $ 735
Remitted earnings from foreign operations |  |  |  | 0 | 0 | (6,574)
State taxes, net of federal income tax benefit |  |  |  | 520 | 656 | 647
Foreign rate differences |  |  |  | $ 1,805 | $ 2,546 | $ 499
Valuation allowance due to foreign losses and impairments |  |  |  | (2.70%) | (139.30%) | (1.50%)
Income tax expense (benefit) at effective income tax rate |  |  |  | $ (11,526) | $ 53,163 | $ (3,217)
State And Foreign Net Operating Loss Carryforwards |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards | 23,500,000 |  |  | 23,500,000 | 33,400,000 |
Valuation allowance | 7,700,000 |  |  | 7,700,000 | 8,500,000 | 1,500,000
Excess Capital Losses From Investments And Other Related Items |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowance | 4,400,000 |  |  | 4,400,000 | 1,200,000 | $ 11,200,000
Asset Impairments In Foreign Jurisdictions |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation allowance | 15,800,000 |  |  | $ 15,800,000 | $ 15,600,000 |
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% |  |
Hungary |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income 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% |  |
Minimum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Net Operating Loss Carrforward Expiration Period |  |  |  | 9 years |  |
Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Net Operating Loss Carrforward Expiration Period |  |  |  | 20 years |  |
Flexible Packaging Films [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Effective Tax Rate Reconciliation Worthless Stock Deductions, Amount | 54,000,000 |  |  |  |  |
Effective Tax Rate Reconciliation Worthless Stock Deductions, Amount, Effect of Tax Rate Change | 4,800,000 |  |  |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations |  | $ 400,000 |  |  |  |
Worthless Stock Tax Deductible Amount | $ 153,000,000 | $ 8,100,000 |  |  |  |
Foreign Earnings Repatriated |  |  | $ 10,700,000 |  |  |
Foreign Tax Credit - Brazil |  |  |  | $ 1,300,000 |  |

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