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Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Goodwill $ 91,521 $ 91,348
Total assets 957,072 947,969
Operating segment | LED And Solar
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Goodwill 91,521 91,348
Total assets 384,903 359,464
Operating segment | Data Storage
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Total assets 35,611 37,910
Unallocated
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Total assets $ 536,558 $ 550,595