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Acquisitions - Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
May 02, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 781,070   $ 691,712
Caisson Interventional LLC      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 1,468  
In-process research and development   89,000  
Goodwill   42,417  
Other assets   918  
Current liabilities   1,023  
Deferred income tax liabilities, net   16,009  
Net assets acquired   $ 116,771