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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
segment
Mar. 31, 2011
Segment Information    
Number of reportable segments 2  
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax    
Net sales $ 139,909 $ 254,676
Segment profit (loss) 25,354 90,916
Interest, net (203) 1,299
Amortization 1,215 908
Equity-based compensation 3,130 2,800
Restructuring 63  
Loss on extinguishment of debt   304
Income from continuing operations before income taxes 21,149 85,605
LED And Solar
    
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax    
Net sales 95,574 214,698
Segment profit (loss) 17,486 80,977
Amortization 863 487
Equity-based compensation 1,006 679
Restructuring 58  
Income from continuing operations before income taxes 15,559 79,811
Data Storage
    
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax    
Net sales 44,335 39,978
Segment profit (loss) 8,953 12,231
Amortization 352 363
Equity-based compensation 411 308
Restructuring 5  
Income from continuing operations before income taxes 8,185 11,560
Unallocated Corporate Amount
    
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax    
Segment profit (loss) (1,085) (2,292)
Interest, net (203) 1,299
Amortization   58
Equity-based compensation 1,713 1,813
Loss on extinguishment of debt   304
Income from continuing operations before income taxes $ (2,595) $ (5,766)