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Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (85,840) | $ (80,030)
Foreign currency exchange rate fluctuations | 567 | 107
Total intangibles assets, gross carrying amount | 247,731 | 248,030
Total intangible assets, net carrying amount | 162,458 | 168,107
In-process technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | 0 | 0
Foreign currency exchange rate fluctuations | 0 | 0
Indefinite-lived intangible assets | 3,900 | 3,900
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 133,950 | 133,913
Accumulated amortization | (36,356) | (33,526)
Foreign currency exchange rate fluctuations | 314 | 65
Net carrying amount | $ 97,908 | $ 100,452
Customer relationships | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 1 year | 1 year
Customer relationships | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 30 years | 30 years
Acquired technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 74,371 | $ 74,593
Accumulated amortization | (23,359) | (21,523)
Foreign currency exchange rate fluctuations | 203 | 34
Net carrying amount | $ 51,215 | $ 53,104
Acquired technology | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 3 years | 3 years
Acquired technology | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 20 years | 20 years
Backlog |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 21,712 | $ 21,712
Accumulated amortization | (18,424) | (17,544)
Foreign currency exchange rate fluctuations | 0 | 0
Net carrying amount | $ 3,288 | $ 4,168
Backlog | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 1 year | 1 year
Backlog | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 4 years | 5 years
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 8,662 | $ 8,716
Accumulated amortization | (4,861) | (4,719)
Foreign currency exchange rate fluctuations | 38 | 6
Net carrying amount | $ 3,839 | $ 4,003
Trade names | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 1 year | 1 year
Trade names | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 12 years | 12 years
Patents |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 3,236 | $ 3,296
Accumulated amortization | (1,390) | (1,418)
Foreign currency exchange rate fluctuations | 12 | 2
Net carrying amount | $ 1,858 | $ 1,880
Patents | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 2 years | 2 years
Patents | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful life (in years) | 20 years | 20 years
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 1,900 | $ 1,900
Accumulated amortization | (1,450) | (1,300)
Foreign currency exchange rate fluctuations | 0 | 0
Net carrying amount | $ 450 | $ 600
Useful life (in years) | 3 years | 3 years

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