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Acquisitions - Purchase Price Allocation (Vascular Access Technologies, Inc.) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
May 01, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 234,043   $ 211,927
Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Goodwill   $ 4,170  
Deferred tax liabilities   (3,170)  
Total assets acquired   9,900  
Preliminary Allocation | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Goodwill   4,323  
Deferred tax liabilities   (3,073)  
Total assets acquired   9,900  
Adjustment | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Goodwill   (153)  
Deferred tax liabilities   (97)  
Total assets acquired   0  
Developed Technology Rights | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Intangibles   7,800  
Developed Technology Rights | Preliminary Allocation | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Intangibles   7,800  
Developed Technology Rights | Adjustment | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Intangibles   0  
In-process technology | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Intangibles   1,100  
In-process technology | Preliminary Allocation | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Intangibles   850  
In-process technology | Adjustment | Vascular Access Technologies, Inc.      
Business Acquisition [Line Items]      
Intangibles   $ 250