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Acquisitions (Details 4) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Jun. 03, 2011
Jun. 03, 2011
CRI
Dec. 31, 2010
Various business combinations and technology asset acquisitions
Dec. 31, 2009
GLT
Y
Consideration paid by the company            
Total purchase price     $ 257,243,000   $ 27,700,000 $ 26,000,000
Cash     168,805,000 168,800,000    
Direct acquisition costs 3,900,000       300,000 1,100,000
Purchase price from the business combination was allocated as follows:            
Identified intangible assets     159,200,000   24,400,000 14,900,000
Property and equipment     965,000   700,000  
Goodwill     96,994,000   2,600,000 11,100,000
Purchase of patents related to other technologies           $ 2,500,000
Minimum useful life (in years) 1 1       3
Maximum useful life (in years) 10 10       7
Maximum number of years over which the achievement of certain performance matrics and milestones occurs (in years)           20