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Intangible Assets and Goodwill (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of intangible assets |  |  |
Accumulated Amortization | $ (240,480) | $ (194,777) |
Finite-lived intangible assets | 86,622 |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 5,100 |  |
Intangible Assets, Gross (Excluding Goodwill) | 332,202 | 327,165 |
Amortization expense for intangible assets | 41,962 | 37,138 | $ 25,074
Intangible Assets, Net | $ 91,722 | $ 132,388 |
Minimum |  |  |
Components of intangible assets |  |  |
Useful Life (in years) | 1 year | 1 year |
Maximum |  |  |
Components of intangible assets |  |  |
Useful Life (in years) | 10 years | 10 years |
Favorable Contracts [Member] |  |  |
Components of intangible assets |  |  |
Finite-lived intangible assets | $ 1,700 | $ 3,600 |
Existing technology |  |  |
Components of intangible assets |  |  |
Gross Carrying Amount | 258,008 | 256,656 |
Accumulated Amortization | (191,554) | (156,577) |
Finite-lived intangible assets | $ 66,454 | $ 100,079 |
Existing technology | Minimum |  |  |
Components of intangible assets |  |  |
Useful Life (in years) | 3 years | 3 years |
Existing technology | Maximum |  |  |
Components of intangible assets |  |  |
Useful Life (in years) | 10 years | 10 years |
Customer contracts and contractual relationships |  |  |
Components of intangible assets |  |  |
Gross Carrying Amount | $ 68,794 | $ 65,109 |
Accumulated Amortization | (48,626) | (37,900) |
Finite-lived intangible assets | $ 20,168 | $ 27,209 |
Customer contracts and contractual relationships | Minimum |  |  |
Components of intangible assets |  |  |
Useful Life (in years) | 1 year | 1 year |
Customer contracts and contractual relationships | Maximum |  |  |
Components of intangible assets |  |  |
Useful Life (in years) | 10 years | 10 years |
Non-competition agreements |  |  |
Components of intangible assets |  |  |
Gross Carrying Amount | $ 300 | $ 300 |
Accumulated Amortization | (300) | (300) |
Finite-lived intangible assets | $ 0 | $ 0 |
Useful Life (in years) | 3 years | 3 years |
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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