Other Operating Charges (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Operating Costs [Line Items]
Other operating charges	$ 6,359,000	$ 9,165,000	$ 6,425,000
Operating Expense
Other Operating Costs [Line Items]
Other operating charges	6,359,000	9,165,000	6,425,000
Operating Expense | U.S. and Europe
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	1,200,000	1,700,000	1,700,000
Operating Expense | North America
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	1,000,000
Out of period adjustments	800,000
Nondebtor reorganization items, legal and advisory professional fees			1,000,000
Business acquisition, transaction costs			300,000
U.S. Residential Products | Operating Expense
Other Operating Costs [Line Items]
Other operating charges	487,000	289,000	590,000
U.S. Residential Products | Operating Expense | North America
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	400,000
U.S. Commercial Products | Operating Expense
Other Operating Costs [Line Items]
Other operating charges	1,555,000	621,000	290,000
U.S. Commercial Products | Operating Expense | North America
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	400,000
European Roll Coated Aluminum | Operating Expense
Other Operating Costs [Line Items]
Other operating charges	360,000	497,000	683,000
European Roll Coated Aluminum | Operating Expense | U.K.
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	400,000
European Engineered Products | Operating Expense
Other Operating Costs [Line Items]
Other operating charges	1,567,000	5,472,000	3,406,000
Relocation and plant consolidation costs			3,400,000
European Engineered Products | Operating Expense | U.K.
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	600,000	1,900,000	3,200,000
Relocation and plant consolidation costs		5,500,000
Capitalized computer software, impairments	1,100,000	1,100,000
European Engineered Products | Operating Expense | U.K. | Fair Value, Inputs, Level 1
Other Operating Costs [Line Items]
Asset impairment charges	1,600,000
European Engineered Products | Operating Expense | France
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	1,000,000	900,000	200,000
Other Non-Allocated | Operating Expense
Other Operating Costs [Line Items]
Other operating charges	2,390,000	2,286,000	1,456,000
Other Non-Allocated | Operating Expense | North America
Other Operating Costs [Line Items]
Other severance and nonrecurring costs	200,000
Transition service agreement costs			$ 2,000,000