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Acquisition Of On-X Life Technologies (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jan. 20, 2016
Business Acquisition [Line Items]      
Goodwill $ 78,294 $ 78,294  
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