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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | $ 0 | $ 44,465 | $ 0
Goodwill |  | 117,822 | 117,839 | 169,687
Identifiable intangible assets: |  |  |  |
Total carrying value of other intangibles |  | 33,601 | 35,233 |
Intangible Assets, Net (Including Goodwill) |  | 151,423 | 153,072 |
Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Other identifiable intangibles |  | 14,844 | 15,620 |
Finite-Lived Intangible Assets, Gross |  | 26,021 | 23,766 |
Proprietary technology |  |  |  |
Identifiable intangible assets: |  |  |  |
Other identifiable intangibles |  | 7,582 | 9,037 |
Finite-Lived Intangible Assets, Gross |  | 17,366 | 16,738 |
Noncompete agreements |  |  |  |
Identifiable intangible assets: |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 4,154 | 4,154 |
Trade names |  |  |  |
Identifiable intangible assets: |  |  |  |
Trade names |  | $ 11,175 | 10,576 |
Minimum | Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) |  | 10 years |  |
Maximum | Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) |  | 12 years |  |
Maximum | Proprietary technology |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) |  | 15 years |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ 44,500 | $ 0 | 44,465 | 0
Goodwill |  | $ 0 | $ 0 | $ 51,831
Identifiable intangible assets: |  |  |  |
Goodwill, Impairment Loss, Net of Tax | $ 44,500 |  |  |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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