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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 22,636 |  |  |
PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 610 | $ 730 | $ 845 |
Amortization | (120) | (115) |  |
Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 2,327 | 2,811 | 3,528 |
Amortization | (426) | (436) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (58) | (281) |  |
Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 19,699 | 32,754 | 36,179 |
Amortization | (13,055) | (3,425) |  |
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 20,198 | 22,785 |  |
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 | 554 | 661 | 831 |
Amortization | (91) | (82) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (16) | (88) |  |
Impairment of Intangible Assets, Finite-lived |  |  | (9,444) |
Customer Relationships [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 19,644 | 22,124 | 24,613 |
Amortization | (2,480) | (2,489) |  |
Proprietary Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 895 | 1,093 |  |
Proprietary Technology [Member] | PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 610 | 730 | 845 |
Amortization | (120) | (115) |  |
Proprietary Technology [Member] | Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 230 | 288 | 360 |
Amortization | (55) | (55) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (3) | (17) |  |
Impairment of Intangible Assets, Finite-lived |  |  | (4,051) |
Proprietary Technology [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 55 | 75 | 495 |
Amortization | (20) | (420) |  |
Trade Names [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,543 | 12,417 |  | $ 10,200
Trade Names [Member] | PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 0 | 0 | 0 |
Amortization | 0 | 0 |  |
Impairment of Intangible Assets, Finite-lived |  |  | (4,005) |
Trade Names [Member] | Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,543 | 1,862 | 2,337 |
Amortization | (280) | (299) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (39) | (176) |  |
Trade Names [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 0 | 10,555 | $ 11,071 |
Amortization | $ (10,555) | $ (516) |  |

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