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Discontinued Operations (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 12, 2008	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 0	$ 0	$ 4,500
Aluminum Extrusions Canada Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 25,000
Accrual for indemnifications under the purchase agreement related to environmental matters				(900)
Accrual for indemnifications under the purchase agreement related to environmental matters, net of tax				$ (900)

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- Definition

Amount before tax of an increase (decrease) to a gain (loss) previously reported in discontinued operations in a prior period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after tax of an increase (decrease) to a gain (loss) previously reported in discontinued operations in a prior period.

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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