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Foreign Operations, Geographic Area and Product Segment Information (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets      
Goodwill $ 55,828 $ 52,003 $ 52,003
Total assets 936,063 1,148,034  
LED And Solar
      
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets      
Goodwill 55,828 52,003  
Total assets 319,457 323,096  
Data Storage
      
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets      
Total assets 57,203 61,691  
Unallocated Corporate Amount
      
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets      
Total assets $ 559,403 $ 763,247