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Financial Instruments Financial Instruments (Summary of Location and Fair Value of Currency Forward Derivative Financial Instruments - Terphane (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) recognized in other comprehensive income	$ 0	$ 0	$ 0
Aluminum Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) recognized in other comprehensive income	1,501	394	(5,055)
Selling, General and Administrative Expenses [Member] | Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion)	(43)
Amount of pre-tax gain (loss) recognized in other comprehensive income	(561)
Cost of Sales [Member] | Flexible Packaging Films [Member] [Domain]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion)	62	62	62
Cost of Sales [Member] | Aluminum Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Amount of pre-tax gain (loss) reclassified from accumulated other comprehensive income to net income (effective portion)	$ 1,210	$ (1,630)	$ (3,538)

X

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

+ Details

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X

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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