Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
Dec. 31, 2014 segments	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 204,053,000us-gaap_Goodwill	$ 199,375,000us-gaap_Goodwill
Acquisition of Cleveland Tubing, Inc.		48,000us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation	(13,895,000)us-gaap_GoodwillTranslationAdjustments	4,630,000us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance	190,158,000us-gaap_Goodwill	204,053,000us-gaap_Goodwill
Goodwill, Impaired [Abstract]
Number of operating segments	5us-gaap_NumberOfOperatingSegments
Number of reportable segments	4us-gaap_NumberOfReportableSegments
U.S. Residential Products
Goodwill [Roll Forward]
Goodwill, beginning balance	72,291,000	72,243,000
Acquisition of Cleveland Tubing, Inc.		48,000
Foreign currency translation	0	0
Goodwill, ending balance	72,291,000	72,291,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	150,600,000	150,900,000
U.S. Commercial Products
Goodwill [Roll Forward]
Goodwill, beginning balance	9,067,000	9,067,000
Acquisition of Cleveland Tubing, Inc.		0
Foreign currency translation	0	0
Goodwill, ending balance	9,067,000	9,067,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	58,700,000	58,700,000
European Roll Coated Aluminum
Goodwill [Roll Forward]
Goodwill, beginning balance	109,549,000	105,165,000
Acquisition of Cleveland Tubing, Inc.		0
Foreign currency translation	(13,119,000)	4,384,000
Goodwill, ending balance	96,430,000	109,549,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	53,000,000	60,200,000
European Engineered Products
Goodwill [Roll Forward]
Goodwill, beginning balance	13,146,000	12,900,000
Acquisition of Cleveland Tubing, Inc.		0
Foreign currency translation	(776,000)	246,000
Goodwill, ending balance	12,370,000	13,146,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	$ 9,600,000	$ 10,200,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

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

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