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Discontinued Operations (Details) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Nov. 20, 2012
Falling Springs [Member]
Feb. 12, 2008
Aluminum Extrusions Canada Business [Member]
Jun. 30, 2013
Aluminum Extrusions Canada Business [Member]
Jun. 30, 2013
Aluminum Extrusions Canada Business [Member]
Jun. 30, 2012
Aluminum Extrusions Canada Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale of membership interests     $ 16,600,000        
Proceeds from sale of business     12,800,000 25,000,000      
Common stock received from sale of membership interests     209,576        
Sales reclassified to discontinued operations 200,000 800,000          
Net income (loss) reclassified to discontinued operations (35,000) 26,000          
Charges for indemnifications under the purchase agreement related to environmental matters         (8,300,000) (13,500,000) (4,800,000)
Charges for indemnifications under the purchase agreement related to environmental matters, net of tax         $ (8,300,000) $ (13,500,000) $ (4,800,000)