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Inventories And Deferred Preservation Costs (Schedule Of Deferred Preservation Costs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total deferred preservation costs $ 35,671 $ 30,688
Cardiac Tissues [Member]    
Total deferred preservation costs 16,988 15,768
Vascular Tissues [Member]    
Total deferred preservation costs $ 18,683 $ 14,920