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Segment Reporting Schedule Of Long-Lived Assets By Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Property, plant and equipment	$ 831,703	$ 833,907	$ 776,884
Industrial Materials [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		685,243	649,389
Engineered Solutions [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment		$ 148,664	$ 127,495

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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