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Property, Plant and Equipment, Net (Details) (USD $) In Thousands	9 Months Ended																		3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Land	Dec. 31, 2010 Land	Sep. 30, 2010 Land	Sep. 30, 2011 Buildings and site improvements	Dec. 31, 2010 Buildings and site improvements	Sep. 30, 2010 Buildings and site improvements	Sep. 30, 2011 Leasehold improvements	Dec. 31, 2010 Leasehold improvements	Sep. 30, 2010 Leasehold improvements	Sep. 30, 2011 Machinery and equipment	Dec. 31, 2010 Machinery and equipment	Sep. 30, 2010 Machinery and equipment	Sep. 30, 2011 Capital projects in progress	Dec. 31, 2010 Capital projects in progress	Sep. 30, 2010 Capital projects in progress	Jun. 30, 2011 San Leandro Facility
Property, Plant and Equipment
Property, plant and equipment, gross	$ 388,479	$ 359,695	$ 357,932	$ 28,889	$ 26,384	$ 26,589	$ 152,167	$ 141,834	$ 144,861	$ 3,736	$ 3,693	$ 3,551	$ 203,687	$ 186,021	$ 184,694
Accumulated depreciation and amortization	(199,614)	(186,996)	(189,751)
Property, plant and equipment excluding capital projects in progress, net	188,865	172,699	168,181
Capital projects in progress																2,151	8,891	3,765
Property, plant and equipment, net	191,016	176,464	177,072
Impairment charges for facility closure	$ 1,094	$ 16,916																	$ 1,100

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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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