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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment charge |  |  |  | $ 0 | $ 0 | $ 44,465
Goodwill | $ 128,208 | $ 117,822 |  | 128,208 | 117,822 | 117,839
Loss on asset impairments |  |  |  | 101,282 | 1,436 | 403
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 44,500 | 0 | 0 | 44,465
Goodwill, Impairment Loss, Net of Tax |  |  | $ 44,500 |  |  |
Flexible Packaging Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Assets, Fair Value Disclosure | 30,000 |  |  | 30,000 |  |
Loss on asset impairments | 101,000 |  |  | 101,000 |  |
Asset Impairment Charges After Taxes | 87,000 |  |  | 87,000 |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 17,500 |  |
PE Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 104,142 | 104,126 |  | 104,142 | $ 104,126 | $ 104,143
Loss on asset impairments | 0 | 200 |  |  |  |
Asset Impairment Charges After Taxes | 300 | $ 100 |  |  |  |
Customer Relationships [Member] | Personal Care Materials [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 46,800 |  |  | 46,800 |  |
Trade Names [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Trade names (cost basis of $13,887 in 2017 and $11,175 in 2016) | 4,800 |  |  | 4,800 |  |
Goodwill [Member] | Personal Care Materials [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 46,800 |  |  | 46,800 |  |
Goodwill [Member] | Surface Protection Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 57,300 |  |  | 57,300 |  |
Goodwill [Member] | Aacoa [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 13,700 |  |  | 13,700 |  |
Goodwill [Member] | Futura [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 10,400 |  |  | 10,400 |  |
Customer Relationships [Member] | Flexible Packaging Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 9,444 |  |
Finite-lived Intangible Assets, Fair Value Disclosure | 800 |  |  | 800 |  |
Proprietary Technology [Member] | Flexible Packaging Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 4,051 |  |
Finite-lived Intangible Assets, Fair Value Disclosure | 400 |  |  | 400 |  |
Trade Names [Member] | Flexible Packaging Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Finite-lived Intangible Assets, Fair Value Disclosure | $ 2,400 |  |  | 2,400 |  |
Trade Names [Member] | PE Films [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
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 |  |  |  | 2 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 |  |  |  | 12 years |  |

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