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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, 2017 | Dec. 31, 2016 | Feb. 15, 2017 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 40,552 |  |  |
PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 845 | $ 959 |  | $ 1,073
Amortization | (114) | (114) |  |
Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 3,528 | 24,033 |  | 24,518
Amortization | (2,954) | (2,831) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (51) | 2,346 |  |
Impairment of Intangible Assets, Finite-lived | (17,500) |  |  |
Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 36,179 | 8,609 |  | 9,642
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 30,700 |
Amortization | (3,130) | (1,033) |  |
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 25,444 | 14,844 |  |
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 | 831 | 12,084 |  | 12,380
Amortization | (1,793) | (1,700) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (16) | 1,404 |  |
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 | 24,613 | 2,760 |  | 3,240
Amortization | (2,147) | (480) |  |
Proprietary Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,700 | 7,582 |  |
Proprietary Technology [Member] | PE Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 845 | 959 |  | 1,073
Amortization | (114) | (114) |  |
Proprietary Technology [Member] | Flexible Packaging Films [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 360 | 5,574 |  | 6,362
Amortization | (1,161) | (1,131) |  |
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (2) | 343 |  |
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 | 495 | 1,049 |  | 1,602
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 0 |
Amortization | (554) | (553) |  |
Trade Names [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 13,408 | 11,175 |  |
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) | (33) | 599 |  |
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 | 2,337 | 6,375 |  | 5,776
Trade Names [Member] | Aluminum Extrusions [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 11,071 | 4,800 |  | $ 4,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 6,700 |
Amortization | $ (429) | $ 0 |  |
Aluminum Extrusions [Member] | Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 24,000 |

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