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Acquisition Of JOTEC (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 01, 2017
Oct. 10, 2017
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]              
Financing for business acquisition   $ 255,000          
Term loan balance     $ 228,969   $ 228,969 $ 73,594  
Cash consideration         409 1,226  
Transaction and integration costs     7,400   $ 7,400    
JOTEC [Member]              
Business Acquisition [Line Items]              
Agreement date         Oct. 10, 2017    
Acquisition price   225,000          
Cash consideration $ 168,800            
Escrow deposit, part of payments to acquire business $ 22,500            
Purchase consideration, net of debt and cash acquired     221,869   $ 221,869    
Transaction and integration costs     8,900   8,900    
Revenues     4,100        
Net loss     $ (1,500)   $ (736) $ (1,966)  
Pro forma tax rate         38.00% 38.00% 38.00%
Pro forma loss per common share - basic         $ (0.02) $ (0.06)  
Pro forma amortization of intangible assets       $ 3,800 $ 4,900 $ 5,500  
Pro forma loss per common share - diluted       $ 0.07 $ (0.02) $ (0.06)  
JOTEC [Member] | Clerical Error [Member]              
Business Acquisition [Line Items]              
Pro forma amortization adjustment       $ 3,200   $ 4,300  
JOTEC [Member] | Common Stock [Member]              
Business Acquisition [Line Items]              
Common shares issued 2,682,754            
Common stock value issued in business combination $ 53,100            
Scenario, Actual [Member] | JOTEC [Member]              
Business Acquisition [Line Items]              
Pro forma loss per common share - basic       $ 0.13   $ 0.02  
Reclassification [Member] | JOTEC [Member] | Restatement Adjustment Pro Forma [Member]              
Business Acquisition [Line Items]              
Pro forma loss per common share - basic       $ (0.06)   $ (0.08)  
Term Loan [Member]              
Business Acquisition [Line Items]              
Term loan balance 225,000 225,000          
Senior Secured Credit Facility [Member]              
Business Acquisition [Line Items]              
Credit facility aggregate commitments 255,000            
Revolving Credit Facility [Member]              
Business Acquisition [Line Items]              
Credit facility aggregate commitments $ 30,000 $ 30,000