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Quarterly Information (Unaudited) 2012 Financial Results Overview (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Quarterly Financial Data [Abstract]
Gain(loss) related to certain litigation items	$ 4,100
Lower of cost or market inventory adjustments	8,201	5,434	17,051	9,040	5,762	10,211	5,838
Mark to market of aluminum price protection options		$ 1,778	$ 4,955

X

- Definition

Gain (loss) incurred in risk management activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

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- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

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Certain changes made in the current period to the value and amount of inventory reported.

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.6(b))

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