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Acquisition Of On-X Life Technologies (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 20, 2016
Dec. 22, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Cash consideration       $ 409,000 $ 1,226,000
On-X Agreement [Member]          
Business Acquisition [Line Items]          
Agreement date     Dec. 22, 2015    
Acquisition price $ 128,200,000        
Close date     Jan. 20, 2016    
Total purchase price     $ 128,217,000    
Cash consideration $ 93,600,000        
Common shares issued 3,703,699        
Common stock consideration $ 34,600,000        
Transaction and integration costs       $ 383,000 $ 7,400,000
Escrow deposit, part of payments to acquire business $ 10,000,000        
Pro forma tax rate     38.00% 38.00% 38.00%
Plan [Member] | On-X Agreement [Member]          
Business Acquisition [Line Items]          
Acquisition price   $ 130,000,000