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Intangible Assets and Goodwill (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of intangible assets      
Total Proceeds From Sale Of Intangible Assets   $ 4,400  
Gross Carrying Amount $ 216,714 216,714  
Accumulated Amortization (152,448) (127,343)  
Finite-lived intangible assets 64,266 89,371  
Amortization expense for intangible assets $ 25,074 $ 26,618 $ 28,909
Minimum      
Components of intangible assets      
Useful Life (in years) 1 year 1 year  
Maximum      
Components of intangible assets      
Useful Life (in years) 10 years 10 years  
Existing technology      
Components of intangible assets      
Gross Carrying Amount $ 185,321 $ 185,321  
Accumulated Amortization (127,028) (104,426)  
Finite-lived intangible assets $ 58,293 $ 80,895  
Existing technology | Minimum      
Components of intangible assets      
Useful Life (in years) 3 years 3 years  
Existing technology | Maximum      
Components of intangible assets      
Useful Life (in years) 10 years 10 years  
Customer contracts and contractual relationships      
Components of intangible assets      
Gross Carrying Amount $ 31,093 $ 31,093  
Accumulated Amortization (25,120) (22,617)  
Finite-lived intangible assets $ 5,973 $ 8,476  
Customer contracts and contractual relationships | Minimum      
Components of intangible assets      
Useful Life (in years) 1 year 1 year  
Customer contracts and contractual relationships | Maximum      
Components of intangible assets      
Useful Life (in years) 10 years 10 years  
Non-competition agreements      
Components of intangible assets      
Gross Carrying Amount $ 300 $ 300  
Accumulated Amortization (300) (300)  
Finite-lived intangible assets $ 0 $ 0  
Useful Life (in years) 3 years 3 years