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Acquisition Of On-X Life Technologies (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 78,294 $ 11,365 $ 11,365
On-X Agreement [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents 2,472    
Receivables 6,826    
Inventories 12,889    
Intangible assets 53,950    
Goodwill 68,229    
Other assets 6,891    
Liabilities assumed (23,040)    
Total purchase price $ 128,217