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Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Goodwill | $ 55,828 | $ 55,828
Total assets | 935,883 | 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 | 256,616 | 276,352
Data Storage |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Total assets | 38,465 | 38,664
Unallocated Corporate |  |
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets |  |
Total assets | $ 640,802 | $ 622,288

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