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Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Goodwill $ 91,348 $ 91,348
Total assets 954,557 947,969
Operating segment | LED And Solar
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Goodwill 91,348 91,348
Total assets 373,022 359,464
Operating segment | Data Storage
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Total assets 43,874 37,910
Unallocated
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Total assets $ 537,661 $ 550,595