Segment Reporting - Information by Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 231,466		$ 245,469	$ 249,492	$ 253,410	$ 233,229		$ 253,713	$ 273,410	$ 292,714	$ 979,837		$ 1,053,066		$ 1,270,368
Operating (loss) income											(98,874)		(15,672)		39,796
Total Assets	587,976					679,822					587,976		679,822		788,806
Property, Plant and Equipment, Additions											12,351		11,604		11,650
Depreciation and amortization expense											26,044		26,188		25,867
Metals Segment
Segment Reporting Information [Line Items]
Net Sales											841,672		918,298		1,143,884
Operating (loss) income											(94,708)		(11,571)		48,473
Total Assets	489,563					580,570					489,563		580,570		693,803
Property, Plant and Equipment, Additions											11,184		10,181		9,819
Depreciation and amortization expense											24,380		24,579		24,480
Plastics Segment
Segment Reporting Information [Line Items]
Net Sales											138,165		134,768		126,484
Operating (loss) income											6,354		4,278		3,188
Total Assets	60,970					57,373					60,970		57,373		56,149
Property, Plant and Equipment, Additions											1,167		1,423		1,831
Depreciation and amortization expense											1,664		1,609		1,387
Other
Segment Reporting Information [Line Items]
Net Sales											0	[1]	0	[1]	0	[1]
Operating (loss) income											(10,520)	[1]	(8,379)	[1]	(11,865)	[1]
Total Assets	37,443	[1]				41,879	[1]				37,443	[1]	41,879	[1]	38,854	[1]
Property, Plant and Equipment, Additions											0	[1]	0	[1]	0	[1]
Depreciation and amortization expense											$ 0	[1]	$ 0	[1]	$ 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.