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Business Combinations - Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Apr. 04, 2018
Jan. 16, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 965,697     $ 784,242
ImThera Medical, Inc.        
Business Acquisition [Line Items]        
Goodwill 82,596   $ 87,063  
Goodwill, adjustment (4,467)      
Deferred income tax liabilities, net (29,258)   (27,980)  
Deferred income taxes, net, adjustment (1,278)      
Other assets and liabilities, net 1,036   836  
Other assets and liabilities, net, adjustment 200      
Net assets acquired 216,656   217,185  
Net assets acquired, adjustment $ (529)      
TandemLife        
Business Acquisition [Line Items]        
Goodwill   $ 118,917    
Inventory   10,296    
Deferred income tax liabilities, net   (17,887)    
Other assets and liabilities, net   3,632    
Net assets acquired   243,861    
Useful life 2 years      
In Process Research and Development | ImThera Medical, Inc.        
Business Acquisition [Line Items]        
Intangible asset $ 162,282   151,605  
Intangible asset, adjustment $ 10,677      
In Process Research and Development | TandemLife        
Business Acquisition [Line Items]        
Intangible asset   110,977    
Trade Names | TandemLife        
Business Acquisition [Line Items]        
Intangible asset   11,539    
Useful life 15 years      
Developed Technology | ImThera Medical, Inc.        
Business Acquisition [Line Items]        
Intangible asset $ 0   $ 5,661  
Intangible asset, adjustment $ (5,661)      
Developed Technology | TandemLife        
Business Acquisition [Line Items]        
Intangible asset   $ 6,387