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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 10 Months Ended | 19 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 975,904 | 313,834 |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 12,879 | $ 5,062 |  |  |
Asset impairments and costs associated with exit and disposal activities, net of adjustments | 1,056 | 123 |  |  |
Income before income taxes | 23,811 | 23,451 |  |  |
(Gain)/loss on asset impairments and divestitures | 421 | 0 |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | (17,082) | (8,200) |  |  |
Gain (Loss) on Disposition of Assets | (385) | 0 |  |  |
Payments for Restructuring | 468 |  |  |  |
Restructuring Reserve | 960 |  | $ 960 |  | $ 776
kaleo |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | (17,082) | (8,200) |  |  |
Unrealized gain (loss) on investment under fair value method, after taxes | 14,300 | 6,400 |  |  |
Other Interest and Dividend Income | 17,582 |  |  |  |
Terphane Ltda [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Professional Fees |  | 300 |  |  |
PE Films |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Production LIne Start-up and Ramp-up Costs | 300 |  |  |  |
Pretax charges for severance and other employee-related costs | 400 | 100 |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | (1,378) | (1,052) |  |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | 0 | 0 |  |  |
Aluminum Extrusions |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Plant shutdowns, asset impairments, restructurings and other | (40) | (53) |  |  |
Corporate Segment [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Professional Fees | 900 |  |  |  |
Severance (a) |  |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Payments for Restructuring | 242 |  |  |  |
Restructuring Reserve | 829 |  | 829 |  | $ 616
Film Products Manufacturing Facility In Shanghai, China [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Property, Plant and Equipment, Disposals | 400 |  |  |  |
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Other Restructuring Costs after Taxes | 200 | $ 1,000 | 3,500 |  |
Film Products Manufacturing Facility In Shanghai, China [Member] | Other Restructuring [Member] | PE Films |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  | $ 2,900 |
Accelerated Depreciation Expense |  |  |  | 600 |
Restructuring and Disposal Activities - Anticipated Cash Cost Savings |  |  |  | 1,700 |
Other Restructuring Costs |  |  |  | 1,600 |
Other Plant Consolidation Expenses - Cost of Goods Sold |  |  |  | 500 |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  | $ 5,000 |
Payments for Restructuring | 200 |  | $ 2,700 |  |
Pension Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Defined Benefit Plan Estimated Required Future Employer Contributions In Current Fiscal Year | $ 8,100 |  |  |  |

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