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Intangible Assets and Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Components of intangible assets      
Gross Carrying Amount $ 232,327 $ 68,917  
Accumulated Amortization (50,372) (27,931)  
Net Carrying Amount 181,955 40,986  
Minimum useful life (in years) 1 1  
Maximum useful life (in years) 10 10  
Amortization expense for intangible assets 20,191 5,066 2,984
Patents
      
Components of intangible assets      
Gross Carrying Amount 28,643 24,433  
Accumulated Amortization (12,997) (9,361)  
Net Carrying Amount 15,646 15,072  
Minimum useful life (in years) 3 3  
Maximum useful life (in years) 10 10  
Customer contracts and contractual relationships
      
Components of intangible assets      
Gross Carrying Amount 33,550 4,050  
Accumulated Amortization (7,148) (3,127)  
Net Carrying Amount 26,402 923  
Minimum useful life (in years) 1 1  
Maximum useful life (in years) 10 10  
Existing technology
      
Components of intangible assets      
Gross Carrying Amount 159,350 29,950  
Accumulated Amortization (19,685) (4,959)  
Net Carrying Amount 139,665 24,991  
Minimum useful life (in years) 3 3  
Maximum useful life (in years) 7 7  
Intellectual property
      
Components of intangible assets      
Gross Carrying Amount 10,384 10,384  
Accumulated Amortization (10,384) (10,384)  
Useful life (in years) 4 4  
Non-competition agreements
      
Components of intangible assets      
Gross Carrying Amount 400 100  
Accumulated Amortization (158) (100)  
Net Carrying Amount $ 242    
Useful life (in years) 3 3