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Amortizable Intangible Assets (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Goodwill information for each reporting unit  
Balance at the beginning of the period $ 115,148
Addition to goodwill 23,521
Balance at the end of the period 138,669
Semiconductor Business Group (SBG)
  
Goodwill information for each reporting unit  
Balance at the beginning of the period 4,454
Addition to goodwill 15,451
Balance at the end of the period 19,905
All Other
  
Goodwill information for each reporting unit  
Balance at the beginning of the period 110,694
Addition to goodwill 8,070
Balance at the end of the period $ 118,764