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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Components of intangible assets |  |  |  |  |
Accumulated Amortization | $ (230,023) |  | $ (230,023) |  | $ (194,777)
Intangible Assets, Gross (Excluding Goodwill) | 332,568 |  | 332,568 |  | 327,165
Amortization expense for intangible assets | 10,500 | $ 10,200 | 31,436 | $ 26,045 |
Intangible Assets, Net | 102,545 |  | 102,545 |  | 132,388
Existing technology |  |  |  |  |
Components of intangible assets |  |  |  |  |
Gross Carrying Amount | 258,792 |  | 258,792 |  | 256,656
Accumulated Amortization | (183,590) |  | (183,590) |  | (156,577)
Net Carrying Amount | 75,202 |  | $ 75,202 |  | $ 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 | 68,376 |  | $ 68,376 |  | $ 65,109
Accumulated Amortization | (46,133) |  | (46,133) |  | (37,900)
Net Carrying Amount | 22,243 |  | $ 22,243 |  | $ 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 | 500 | $ 600 | 2,800 | $ 4,700 |
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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