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Commitments and Contingencies and Other Matters (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
LED And Solar
Dec. 31, 2009
LED And Solar
Jul. 31, 2011
CIGS Solar Systems Abandonment
Employee
Dec. 31, 2011
CIGS Solar Systems Abandonment
Dec. 31, 2010
Data storage facilities
facility
Dec. 31, 2009
Data storage facilities
Camarillo, CA
Dec. 31, 2011
Data Storage Products
Dec. 31, 2010
Data Storage Products
Dec. 31, 2009
Data Storage Products
Dec. 31, 2011
Personnel severance and related costs
Employee
Dec. 31, 2009
Personnel severance and related costs
Employee
Dec. 31, 2010
Lease-related and other (credits) costs
Dec. 31, 2009
Lease-related and other (credits) costs
Reconciliation of the liability associated with prior restructuring charges                                
Restructuring $ 1,288,000 $ (179,000) $ 4,479,000 $ 204,000 $ 838,000   $ 22,100,000   $ 1,400,000 $ 1,300,000 $ (200,000) $ 4,500,000 $ 1,288,000 $ 3,109,000 $ (179,000) $ 1,370,000
Inventory write-offs 800,000   1,526,000 800,000     27,000,000         1,500,000        
Severance and related costs             $ 2,300,000           $ 1,300,000 $ 3,100,000    
Number of employees impacted           80             65 161    
Number of leased facilities with change in estimate of restructuring credit               1