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Acquisition of Ascyrus (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 02, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Dec. 01, 2017
Business Acquisition [Line Items]          
Term loan balance   $ 299,848 $ 299,848 $ 223,176  
Contingent consideration liability   55,407 55,407  
Goodwill   253,995 253,995 186,697  
Following FDA Approval For AMDS [Member]          
Business Acquisition [Line Items]          
Aggregate amount of consideration transferred     $ 120,000    
Ascyrus Medical LLC [Member]          
Business Acquisition [Line Items]          
Aggregate amount of consideration transferred $ 83,700        
Total consideration $ 139,067        
Equity ownership percent 100.00%        
Cash consideration $ 63,660        
Common shares issued 991,800        
Common stock value issued in business combination $ 20,000        
Period for weighted average closing price     10 days    
Contingent consideration liability 55,407        
Goodwill 62,724 62,700 $ 62,700    
Fair value of combined purchase consideration 139,067        
Transaction and integration costs   618 677    
Ascyrus Medical LLC [Member] | FDA Approval IDE for AMDS [Member]          
Business Acquisition [Line Items]          
Cash consideration 60,000        
Common stock value issued in business combination 20,000        
Ascyrus Medical LLC [Member] | FDA Approval IDE for AMDS [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Aggregate amount of consideration transferred 200,000        
Ascyrus Medical LLC [Member] | FDA Approves Premarket Approval [Member]          
Business Acquisition [Line Items]          
Cash consideration 10,000        
Common stock value issued in business combination 10,000        
Ascyrus Medical LLC [Member] | AMDS Obtained In Japan [Member]          
Business Acquisition [Line Items]          
Cash consideration 25,000        
Ascyrus Medical LLC [Member] | AMDS Obtained In China [Member]          
Business Acquisition [Line Items]          
Cash consideration 10,000        
Ascyrus Medical LLC [Member] | If Japan Or China Obtains Approval [Member]          
Business Acquisition [Line Items]          
Cash consideration 10,000        
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member]          
Business Acquisition [Line Items]          
Cash consideration 55,000        
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Cash consideration 65,000        
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Cash consideration $ 75,000        
Ascyrus Medical LLC [Member] | Following FDA Approval For AMDS [Member]          
Business Acquisition [Line Items]          
Period of required contingent consideration 3 years        
Term Loan [Member]          
Business Acquisition [Line Items]          
Term loan balance   218,812 218,812 $ 220,500 $ 225,000
Secured Debt [Member]          
Business Acquisition [Line Items]          
Credit facility aggregate commitments         255,000
Revolving Credit Facility [Member]          
Business Acquisition [Line Items]          
Term loan balance   $ 78,662 $ 78,662    
Credit facility aggregate commitments         $ 30,000