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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

X

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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The amount of identifiable intangible assets recognized as of the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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