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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Components of intangible assets |  |  |  |  |
Accumulated Amortization | $ (258,802) |  | $ (258,802) |  | $ (240,480)
Finite-Lived Intangible Assets | 69,340 |  | 69,340 |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 1,600 |  | 1,600 |  |
Intangible Assets, Gross (Excluding Goodwill) | 329,742 |  | 329,742 |  | 332,202
Amortization expense for intangible assets | 8,700 | $ 10,500 | 19,269 | $ 20,938 |
Intangible Assets, Net | 70,940 |  | 70,940 |  | 91,722
Existing technology |  |  |  |  |
Components of intangible assets |  |  |  |  |
Gross Carrying Amount | 259,465 |  | 259,465 |  | 258,008
Accumulated Amortization | (206,160) |  | (206,160) |  | (191,554)
Finite-Lived Intangible Assets | 53,305 |  | $ 53,305 |  | $ 66,454
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 | 68,377 |  | $ 68,377 |  | $ 68,794
Accumulated Amortization | (52,342) |  | (52,342) |  | (48,626)
Finite-Lived Intangible Assets | 16,035 |  | $ 16,035 |  | $ 20,168
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)
Finite-Lived Intangible Assets | 0 |  | 0 |  | 0
Favorable contracts |  |  |  |  |
Components of intangible assets |  |  |  |  |
Finite-Lived Intangible Assets | 1,000 |  | 1,000 |  | 1,700
Cash received related to favorable contracts | 300 | $ 1,200 | 1,000 | $ 2,400 |
In Process Research and Development [Member] |  |  |  |  |
Components of intangible assets |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 1,600 |  | $ 1,600 |  | $ 5,100

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