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Business Combinations - Purchase Price Composition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 04, 2018
Jan. 16, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]            
Gain from acquisition     $ 0 $ 39,428 $ 11,484 $ 39,428
ImThera Medical, Inc.            
Business Acquisition [Line Items]            
Cash   $ 78,332        
Contingent consideration   112,744        
Fair value of our interest prior to the acquisition   25,580        
Fair value of consideration transferred   $ 216,656        
Gain from acquisition         11,500  
Fair value in excess of carrying value adjustment         $ 14,100  
TandemLife            
Business Acquisition [Line Items]            
Cash $ 203,671          
Contingent consideration 40,190          
Fair value of consideration transferred $ 243,861