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Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Segment information for total assets
Consolidated	$ 885,165	$ 822,323
Consolidated	40,731	36,460
Metals Segment [Member]
Segment information for total assets
Consolidated	786,652	729,692
Plastics Segment [Member]
Segment information for total assets
Consolidated	57,782	56,171
Other [Member]
Segment information for total assets
Consolidated	$ 40,731	$ 36,460

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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