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Intangible Asset and Goodwill (Details 3) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Components of intangible assets          
Gross Carrying Amount $ 273,040   $ 273,040   $ 216,714
Accumulated Amortization (172,140)   (172,140)   (152,448)
Net Carrying Amount 100,900   100,900   64,266
Amortization expense for intangible assets 8,200 $ 6,300 15,871 $ 12,645  
Existing technology          
Components of intangible assets          
Gross Carrying Amount 210,854   210,854   185,321
Accumulated Amortization (139,785)   (139,785)   (127,028)
Net Carrying Amount 71,069   $ 71,069   $ 58,293
Existing technology | Minimum [Member]          
Components of intangible assets          
Useful Life (in years)     3 years   3 years
Existing technology | Maximum [Member]          
Components of intangible assets          
Useful Life (in years)     10 years   10 years
Customer contracts and contractual relationships          
Components of intangible assets          
Gross Carrying Amount 61,886   $ 61,886   $ 31,093
Accumulated Amortization (32,055)   (32,055)   (25,120)
Net Carrying Amount 29,831   $ 29,831   $ 5,973
Customer contracts and contractual relationships | Minimum [Member]          
Components of intangible assets          
Useful Life (in years)     1 year   1 year
Customer contracts and contractual relationships | Maximum [Member]          
Components of intangible assets          
Useful Life (in years)     10 years   10 years
Non-compete agreements          
Components of intangible assets          
Useful Life (in years)     3 years   3 years
Gross Carrying Amount 300   $ 300   $ 300
Accumulated Amortization (300)   (300)   (300)
Net Carrying Amount 0   0   0
Favorable contracts          
Components of intangible assets          
Net Carrying Amount 4,000   4,000   $ 0
Cash received related to favorable contracts $ 2,400 $ 100 $ 4,100 $ 100