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Property, Plant And Equipment (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Plant's assets, net book value	$ 234,549,000	$ 186,834,000
Depreciation expense	22,580,000	20,128,000	16,869,000
Repair and maintenance expenses	15,000,000	15,400,000	11,500,000
Datong, China Virgin Carbon Manufacturing Facility [Member]
Property, Plant and Equipment [Line Items]
Plant's assets, net book value	$ 4,000,000

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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