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Amortizable Intangible Assets and Goodwill (Details 3) (USD $)
In Thousands
9 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Semiconductor Business Group ("SBG")
Dec. 31, 2010
Semiconductor Business Group ("SBG")
Sep. 30, 2011
CRI
Sep. 30, 2011
Lighting and Display Technology group ("LDT")
Dec. 31, 2010
Lighting and Display Technology group ("LDT")
Goodwill information for each reporting unit      
Balance at the beginning of the period$ 18,154$ 4,454$ 4,454 $ 13,700$ 13,700
Addition to goodwill96,994  96,994  
Balance at the end of the period$ 115,148$ 4,454$ 4,454$ 96,994$ 13,700$ 13,700