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Foreign Operations, Geographic Area and Product Segment Information (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Goodwill $ 91,348 $ 55,828
Total assets 947,969 937,304
Operating segment | LED And Solar
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Goodwill 91,348 55,828
Total assets 359,464 276,352
Operating segment | Data Storage
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Total assets 37,910 38,664
Unallocated
    
Reconciliation of Segment goodwill and total assets to Consolidated goodwill and total assets    
Total assets $ 550,595 $ 622,288