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Intangible Assets and Goodwill (Details 3) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Purchased patents        
Amortization of intangible assets   $ 25,074 $ 26,618 $ 28,909
Estimated future amortization expense of intangible assets        
2015   24,311    
2016   23,709    
2017   10,827    
2018   1,789    
2019   1,743    
Thereafter   1,887    
Finite-lived intangible assets   64,266 89,371  
Existing technology        
Estimated future amortization expense of intangible assets        
Finite-lived intangible assets   58,293 80,895  
Favorable contracts.        
Identified intangible assets assumed in the acquisition of CRI        
Cash received related to intangible assets   100 900  
Estimated future amortization expense of intangible assets        
Finite-lived intangible assets   0 100  
Non-competition agreements        
Estimated future amortization expense of intangible assets        
Finite-lived intangible assets   $ 0 $ 0  
Group of purchased intangible assets        
Identified intangible assets assumed in the acquisition of CRI        
Estimated Useful Life (in years) 7 years      
Other non-CRI related Patents        
Purchased patents        
Patents Acquired       2,500
LDT        
Identified intangible assets assumed in the acquisition of CRI        
Impairment charge       $ 4,000