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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