The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can 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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- 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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Property, Plant and Equipment, Net (Details) (USD $) In Thousands	6 Months Ended															3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Jun. 30, 2011 Land	Dec. 31, 2010 Land	Jun. 30, 2010 Land	Jun. 30, 2011 Buildings and site improvements	Dec. 31, 2010 Buildings and site improvements	Jun. 30, 2010 Buildings and site improvements	Jun. 30, 2011 Leasehold improvements	Dec. 31, 2010 Leasehold improvements	Jun. 30, 2010 Leasehold improvements	Jun. 30, 2011 Machinery and equipment	Dec. 31, 2010 Machinery and equipment	Jun. 30, 2010 Machinery and equipment	Jun. 30, 2011 San Leandro Facility
Property, Plant and Equipment
Property, plant and equipment, gross	$ 378,649	$ 348,346	$ 357,932	$ 29,459	$ 26,384	$ 23,182	$ 155,251	$ 141,834	$ 139,304	$ 3,737	$ 3,693	$ 3,543	$ 190,202	$ 186,021	$ 182,317
Accumulated depreciation and amortization	(198,461)	(184,638)	(189,751)
Property, plant and equipment excluding capital projects in progress, net	180,188	163,708	168,181
Capital projects in progress	3,510	21,241	8,891
Property, plant and equipment, net	183,698	184,949	177,072
Impairment charges for facility closure	$ 1,094	$ 17,566														$ 1,100