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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 49,269	$ 44,735	$ 43,588
Capital Expenditures	33,252	15,880	20,418
Film Products [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	39,202	36,315	34,448
Capital Expenditures	30,484	13,107	15,839
Aluminum Extrusions [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	9,984	8,333	9,054
Capital Expenditures	2,332	2,697	4,339
Subtotal [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	49,186	44,648	43,502
Capital Expenditures	32,816	15,804	20,178
General Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	73	75	74
Capital Expenditures	436	76	236
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	49,259	44,723	43,576
Capital Expenditures	33,252	15,880	20,414
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	10	12	12
Capital Expenditures			$ 4

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 17

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Balance Type:	credit
Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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