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Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Intangible Assets [Line Items] |  |
Accumulated amortization | $ (96,673) | $ (78,872)
Foreign currency exchange rate fluctuations | (854) | (516)
Total intangibles assets, gross carrying amount | 247,495 | 247,495
Total intangible assets, net carrying amount | 149,968 | 168,107
In-process technology |  |
Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 3,900 | 3,900
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | 135,234 | 135,234
Accumulated amortization | (42,435) | (33,988)
Foreign currency exchange rate fluctuations | (1,003) | (787)
Net carrying amount | $ 91,796 | $ 100,459
Customer relationships | Minimum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 1 year | 1 year
Customer relationships | Maximum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 30 years | 30 years
Acquired technology |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | $ 74,222 | $ 74,222
Accumulated amortization | (27,011) | (21,345)
Foreign currency exchange rate fluctuations | 123 | 221
Net carrying amount | $ 47,334 | $ 53,098
Acquired technology | Minimum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 3 years | 3 years
Acquired technology | Maximum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 20 years | 20 years
Backlog |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | $ 21,350 | $ 21,350
Accumulated amortization | (19,823) | (17,182)
Foreign currency exchange rate fluctuations | 0 | 0
Net carrying amount | $ 1,527 | $ 4,168
Backlog | Minimum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 1 year | 1 year
Backlog | Maximum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 4 years | 4 years
Trade names |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | $ 7,650 | $ 7,650
Accumulated amortization | (4,193) | (3,688)
Foreign currency exchange rate fluctuations | 21 | 40
Net carrying amount | $ 3,478 | $ 4,002
Trade names | Minimum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 1 year | 1 year
Trade names | Maximum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 12 years | 12 years
Patents |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | $ 3,239 | $ 3,239
Accumulated amortization | (1,461) | (1,369)
Foreign currency exchange rate fluctuations | 5 | 10
Net carrying amount | $ 1,783 | $ 1,880
Patents | Minimum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 2 years | 2 years
Patents | Maximum |  |
Intangible Assets [Line Items] |  |
Useful life (in years) | 20 years | 20 years
Non-compete agreements |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | $ 1,900 | $ 1,900
Accumulated amortization | (1,750) | (1,300)
Foreign currency exchange rate fluctuations | 0 | 0
Net carrying amount | $ 150 | $ 600
Useful life (in years) | 3 years | 3 years

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