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Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Goodwill | $ 55,828 | $ 55,828
Total assets | 954,555 | 936,063
LED And Solar |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Goodwill | 55,828 | 55,828
Total assets | 280,220 | 319,457
Data Storage |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Total assets | 50,397 | 57,203
Unallocated Corporate Amount |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Total assets | $ 623,938 | $ 559,403

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