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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Components of intangible assets |  |  |
Accumulated Amortization | $ (273,177) |  | $ (268,534)
Finite-Lived Intangible Assets | 53,907 |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 1,600 |  |
Intangible Assets, Gross (Excluding Goodwill) | 328,684 |  | 328,470
Amortization expense for intangible assets | 4,988 | $ 10,531 |
Intangible Assets, Net | 55,507 |  | 59,936
Existing technology |  |  |
Components of intangible assets |  |  |
Gross Carrying Amount | 259,389 |  | 258,903
Accumulated Amortization | (217,734) |  | (213,824)
Finite-Lived Intangible Assets | $ 41,655 |  | $ 45,079
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 | $ 67,395 |  | $ 67,667
Accumulated Amortization | (55,143) |  | (54,410)
Finite-Lived Intangible Assets | $ 12,252 |  | $ 13,257
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
Accumulated Amortization | (300) |  | (300)
Finite-Lived Intangible Assets | 0 |  | 0
Favorable contracts |  |  |
Components of intangible assets |  |  |
Finite-Lived Intangible Assets | 500 |  | 900
Cash received related to favorable contracts | 500 | $ 900 |
In Process Research and Development [Member] |  |  |
Components of intangible assets |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 1,600 |  | $ 1,600

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