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Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Intangible Assets [Line Items] |  |
Accumulated amortization | $ (84,416) | $ (102,687)
Foreign currency exchange rate fluctuations | (1,106) | (1,122)
Total intangibles assets, gross carrying amount | 224,415 | 247,495
Total intangible assets, net carrying amount | 138,893 | 143,686
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross carrying amount | 135,234 | 135,234
Accumulated amortization | (47,557) | (45,029)
Foreign currency exchange rate fluctuations | (1,127) | (1,185)
Total | $ 86,550 | $ 89,020
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 | $ 77,142 | $ 78,122
Accumulated amortization | (30,239) | (29,206)
Foreign currency exchange rate fluctuations | 8 | 42
Total | $ 46,911 | $ 48,958
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 | $ 1,150 | $ 21,350
Accumulated amortization | (575) | (20,703)
Foreign currency exchange rate fluctuations | 0 | 0
Total | $ 575 | $ 647
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 | (4,530) | (4,361)
Foreign currency exchange rate fluctuations | 11 | 17
Total | $ 3,131 | $ 3,306
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 | (1,515) | (1,488)
Foreign currency exchange rate fluctuations | 2 | 4
Total | $ 1,726 | $ 1,755
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
Accumulated amortization |  | (1,900)
Foreign currency exchange rate fluctuations |  | 0
Total |  | $ 0
Useful life (in years) | 3 years | 3 years

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