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Acquisition Of JOTEC (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 01, 2017
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Term loan balance   $ 228,969 $ 226,703 $ 226,703 $ 228,969  
JOTEC acquisition measurement period adjustments       $ 3,177    
JOTEC [Member]            
Business Acquisition [Line Items]            
Agreement date       Dec. 01, 2017    
Acquisition price $ 225,000          
Total consideration 222,157          
Cash consideration 169,100          
Common shares issued         2,682,754  
Common stock value issued in business combination         $ 53,100  
Escrow deposit, part of payments to acquire business $ 22,500          
Transaction and integration costs     1,800 $ 6,100    
Revenues   4,100        
Net loss   (1,500)     $ (736) $ (1,966)
Pro forma tax rate         38.00% 38.00%
JOTEC [Member] | Common Stock [Member]            
Business Acquisition [Line Items]            
Common shares issued 2,682,754          
Common stock value issued in business combination $ 53,100          
Term Loan [Member]            
Business Acquisition [Line Items]            
Term loan balance 225,000 $ 225,000 $ 223,313 $ 223,313 $ 225,000  
Term Loan [Member] | JOTEC [Member]            
Business Acquisition [Line Items]            
Term loan balance 225,000          
Senior Secured Credit Facility [Member] | JOTEC [Member]            
Business Acquisition [Line Items]            
Credit facility aggregate commitments 255,000          
Revolving Credit Facility [Member] | JOTEC [Member]            
Business Acquisition [Line Items]            
Credit facility aggregate commitments $ 30,000