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Goodwill And Other Intangible Assets Goodwill and Other Intangible Assets (Rollforward Schedule of Identifiable Intangibles) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Feb. 15, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 36,295 |  |  |
PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 730 | $ 845 |  | $ 959
Amortization | (115) | (114) |  |
Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 2,811 | 3,528 |  | 24,033
Amortization | (436) | (2,954) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (281) | (51) |  |
Impairment of Intangible Assets, Finite-lived |  | (17,500) |  |
Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 32,754 | 36,179 | $ 30,700 | 8,609
Amortization | (3,425) | (3,130) |  |
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 22,785 | 25,444 |  |
Customer Relationships [Member] | PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 0 | 0 |  | 0
Amortization | 0 | 0 |  |
Customer Relationships [Member] | Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 661 | 831 |  | 12,084
Amortization | (82) | (1,793) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (88) | (16) |  |
Impairment of Intangible Assets, Finite-lived | (9,444) | (9,444) |  |
Customer Relationships [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 22,124 | 24,613 | 24,000 | 2,760
Amortization | (2,489) | (2,147) |  |
Proprietary Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,093 | 1,700 |  |
Proprietary Technology [Member] | PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 730 | 845 |  | 959
Amortization | (115) | (114) |  |
Proprietary Technology [Member] | Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 288 | 360 |  | 5,574
Amortization | (55) | (1,161) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (17) | (2) |  |
Impairment of Intangible Assets, Finite-lived | (4,051) | (4,051) |  |
Proprietary Technology [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 75 | 495 | 0 | 1,049
Amortization | (420) | (554) |  |
Trade Names [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 12,417 | 13,408 |  |
Trade Names [Member] | PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 0 | 0 |  | 0
Amortization | 0 | 0 |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (176) | (33) |  |
Impairment of Intangible Assets, Finite-lived | (4,005) | (4,005) |  |
Trade Names [Member] | Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,862 | 2,337 |  | 6,375
Amortization | (299) |  |  |
Trade Names [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 10,555 | 11,071 | $ 6,700 | $ 4,800
Amortization | $ (516) | $ (429) |  |

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