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Major Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Intangible assets |  |
Total intangible assets | $ 188,352 | $ 190,297
Indefinite-lived intangible asset impairment |  |
Intangible assets with indefinite lives impaired | 0 |
Finite-lived intangible assets amortization expense fiscal year maturity |  |
2018 | 19,000 |
2019 | 19,000 |
2020 | 19,000 |
2021 | 19,000 |
2022 | 18,000 |
Customer relationships |  |
Finite-lived intangible assets |  |
Finite-lived intangible assets | $ 103,374 | 111,616
Weighted-Average Life | 8 years |
Trade names |  |
Finite-lived intangible assets |  |
Finite-lived intangible assets | $ 7,279 | 8,034
Weighted-Average Life | 13 years |
Other |  |
Finite-lived intangible assets |  |
Finite-lived intangible assets | $ 7,795 | 4,184
Weighted-Average Life | 10 years |
Trade names |  |
Indefinite-lived intangible assets |  |
Indefinite-lived intangible assets | $ 53,004 | 47,425
In-process research and development |  |
Indefinite-lived intangible assets |  |
Indefinite-lived intangible assets | $ 16,900 | $ 19,038

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