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Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Goodwill | $ 55,828 | $ 55,828
Total assets | 909,113 | 937,304
LED And Solar |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Goodwill | 55,828 | 55,828
Total assets | 235,356 | 276,352
Data Storage |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Total assets | 37,277 | 38,664
Unallocated Corporate Amount |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Total assets | $ 636,480 | $ 622,288

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