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Acquisition - Purchase price allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Oct. 06, 2017
Business Acquisition [Line Items]      
Goodwill $ 337,021 $ 337,028  
Triage Business      
Business Acquisition [Line Items]      
Prepaid expenses and other current assets     $ 796
Assets held for sale     146,540
Inventories     52,205
Property, plant and equipment     10,608
Intangible assets     184,900
Goodwill     245,531
Other non-current assets     182
Total assets acquired     640,762
Other current liabilities     (509)
Total net assets and liabilities acquired     $ 640,253