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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Components of intangible assets |  |  |  |  |
Accumulated Amortization | $ (218,672) |  | $ (218,672) |  | $ (194,777)
Intangible Assets, Gross (Excluding Goodwill) | 330,547 |  | 330,547 |  | 327,165
Amortization expense for intangible assets | 10,500 | $ 8,200 | 20,938 | $ 15,871 |
Intangible Assets, Net | 111,875 |  | 111,875 |  | 132,388
Existing technology |  |  |  |  |
Components of intangible assets |  |  |  |  |
Gross Carrying Amount | 257,911 |  | 257,911 |  | 256,656
Accumulated Amortization | (174,539) |  | (174,539) |  | (156,577)
Net Carrying Amount | 83,372 |  | $ 83,372 |  | $ 100,079
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 [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Gross Carrying Amount | 67,236 |  | $ 67,236 |  | $ 65,109
Accumulated Amortization | (43,833) |  | (43,833) |  | (37,900)
Net Carrying Amount | 23,403 |  | $ 23,403 |  | $ 27,209
Customer Contracts [Member] | Minimum [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Useful Life (in years) |  |  | 1 year |  | 1 year
Customer Contracts [Member] | 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 | 2,200 |  | 2,200 |  | 3,600
Cash received related to favorable contracts | 1,200 | $ 2,400 | 2,400 | $ 4,100 |
In Process Research and Development [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 5,100 |  | $ 5,100 |  | $ 5,100

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