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Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Components of intangible assets |  |  |
Accumulated Amortization | $ (252,491) |  | $ (240,480)
Finite-Lived Intangible Assets | 76,983 |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 5,100 |  |
Intangible Assets, Gross (Excluding Goodwill) | 334,574 |  | 332,202
Amortization expense for intangible assets | 10,531 | $ 10,488 |
Intangible Assets, Net | 82,083 |  | 91,722
Existing technology |  |  |
Components of intangible assets |  |  |
Gross Carrying Amount | 259,017 |  | 258,008
Accumulated Amortization | (200,671) |  | (191,554)
Finite-Lived Intangible Assets | $ 58,346 |  | $ 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 | $ 70,157 |  | $ 68,794
Accumulated Amortization | (51,520) |  | (48,626)
Finite-Lived Intangible Assets | $ 18,637 |  | $ 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
Accumulated Amortization | (300) |  | (300)
Finite-Lived Intangible Assets | 0 |  | 0
Favorable contracts |  |  |
Components of intangible assets |  |  |
Finite-Lived Intangible Assets | 1,300 |  | 1,700
Cash received related to favorable contracts | 900 | $ 1,200 |
In Process Research and Development [Member] |  |  |
Components of intangible assets |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 5,100 |  | $ 5,100

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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