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Acquisition Of On-X Life Technologies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 20, 2016
Dec. 22, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Cash consideration     $ 409 $ 1,226  
Transaction and integration costs     $ 7,400    
On-X Agreement [Member]          
Business Acquisition [Line Items]          
Agreement date     Dec. 22, 2015    
Acquisition price $ 128,200        
Close date     Jan. 20, 2016    
Total purchase price     $ 128,217    
Cash consideration $ 93,600        
Common shares issued 3,703,699        
Common stock consideration $ 34,600        
Escrow deposit, part of payments to acquire business $ 10,000        
Pro forma tax rate     38.00% 38.00% 38.00%
Plan [Member] | On-X Agreement [Member]          
Business Acquisition [Line Items]          
Acquisition price   $ 130,000