Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 segments	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 199,375,000	$ 196,686,000
Acquisition of Cleveland Tubing, Inc.		256,000
Foreign currency translation	4,630,000	2,433,000
Adjustment to Cleveland Tubing, Inc.	48,000
Goodwill, ending balance	204,053,000	199,375,000
Goodwill, Impaired [Abstract]
Number of operating segments	5
Number of reportable segments	4
U.S. Residential Products
Goodwill [Roll Forward]
Goodwill, beginning balance	72,243,000	71,987,000
Acquisition of Cleveland Tubing, Inc.		256,000
Foreign currency translation	0	0
Adjustment to Cleveland Tubing, Inc.	48,000
Goodwill, ending balance	72,291,000	72,243,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	150,900,000	151,200,000
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
Adjustment to Cleveland Tubing, Inc.	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	105,165,000	103,292,000
Acquisition of Cleveland Tubing, Inc.		0
Foreign currency translation	4,384,000	1,873,000
Adjustment to Cleveland Tubing, Inc.	0
Goodwill, ending balance	109,549,000	105,165,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	60,200,000	57,800,000
European Engineered Products
Goodwill [Roll Forward]
Goodwill, beginning balance	12,900,000	12,340,000
Acquisition of Cleveland Tubing, Inc.		0
Foreign currency translation	246,000	560,000
Adjustment to Cleveland Tubing, Inc.	0
Goodwill, ending balance	13,146,000	12,900,000
Goodwill, Impaired [Abstract]
Goodwill, impaired, accumulated impairment loss	$ 10,200,000	$ 10,000,000
Number of reportable segments	1
Unidentified Business Segment [Member]
Goodwill, Impaired [Abstract]
Number of operating segments	2