Segment Reporting - Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net Sales	$ 164,151	$ 184,676	$ 199,703	$ 222,228	$ 231,466	$ 245,469	$ 249,492	$ 253,410	$ 770,758	$ 979,837	$ 1,053,066
Operating loss (a)									(181,674)	(102,839)	(24,590)
Total Assets (b)	497,653				710,674				497,653	710,674	806,485
Property, Plant and Equipment, Additions									8,250	12,351	11,604
Depreciation and amortization expense									24,854	26,044	26,188
Metals Segment
Segment Reporting Information [Line Items]
Net Sales									637,936	841,672	918,298
Operating loss (a)									(177,087)	(98,673)	(20,489)
Total Assets (b)	404,936				612,261				404,936	612,261	707,233
Property, Plant and Equipment, Additions									7,171	11,184	10,181
Depreciation and amortization expense									23,317	24,380	24,579
Plastics Segment
Segment Reporting Information [Line Items]
Net Sales									132,822	138,165	134,768
Operating loss (a)									6,422	6,354	4,278
Total Assets (b)	57,027				60,970				57,027	60,970	57,373
Property, Plant and Equipment, Additions									1,079	1,167	1,423
Depreciation and amortization expense									1,537	1,664	1,609
Other
Segment Reporting Information [Line Items]
Net Sales									0	0	0	[1]
Operating loss (a)									(11,009)	(10,520)	(8,379)	[1]
Total Assets (b)	$ 35,690				$ 37,443				35,690	37,443	41,879	[1]
Property, Plant and Equipment, Additions									0	0	0	[1]
Depreciation and amortization expense									$ 0	$ 0	$ 0	[1]

[1] “Other” – Operating loss includes the costs of executive, legal and elements of the finance department, which are shared by both the Metals and Plastics segments. The “Other” category’s total assets consist of the Company’s investment in joint venture.