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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill impairment charge | $ 0 | $ 46,792 | $ 0
Goodwill | 81,404 | 81,404 | 128,208
Loss on asset impairments | 519 | 223 | 101,282
Personal Care Materials [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment charge | 0 | (46,792) |
Goodwill, Impairment Loss, Net of Tax | 38,200 |  |
Flexible Packaging Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | (426) | (436) |
Assets, Fair Value Disclosure |  | 30,000 |
Loss on asset impairments |  |  | 101,000
Asset Impairment Charges After Taxes |  |  | 87,000
PE Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | (120) | (115) |
Goodwill impairment charge | 0 | (46,792) |
Goodwill | 57,338 | 57,338 | 104,142
Goodwill [Member] | Surface Protection Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 57,300 |  |
Goodwill [Member] | Aacoa [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 13,700 |  |
Goodwill [Member] | Futura [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 10,400 |  |
Customer Relationships [Member] | Flexible Packaging Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | (91) | (82) |
Impairment of Intangible Assets, Finite-lived |  |  | 9,444
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 800
Customer Relationships [Member] | PE Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | 0 | 0 |
Proprietary Technology [Member] | Flexible Packaging Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | (55) | (55) |
Impairment of Intangible Assets, Finite-lived |  |  | 4,051
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 400
Proprietary Technology [Member] | PE Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | (120) | (115) |
Trade Names [Member] | Flexible Packaging Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | (280) | (299) |
Finite-lived Intangible Assets, Fair Value Disclosure |  |  | 2,400
Trade Names [Member] | PE Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Amortization | $ 0 | $ 0 |
Impairment of Intangible Assets, Finite-lived |  |  | $ 4,005
Minimum [Member] | Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Minimum [Member] | Customer Relationships [Member] | Flexible Packaging Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 5 years |
Minimum [Member] | Trade Names [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Maximum [Member] | Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 12 years |  |
Maximum [Member] | Customer Relationships [Member] | Flexible Packaging Films [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 13 years |
Maximum [Member] | Proprietary Technology [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
Maximum [Member] | Trade Names [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 13 years |  |

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