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Inventories And Deferred Preservation Costs (Schedule Of Deferred Preservation Costs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Total deferred preservation costs $ 33,509 $ 35,671
Cardiac Tissues [Member]    
Total deferred preservation costs 16,077 16,988
Vascular Tissues [Member]    
Total deferred preservation costs $ 17,432 $ 18,683