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Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total Sources of Revenue $ 61,948 $ 45,059
Domestic Hospitals [Member]    
Disaggregation of Revenue [Line Items]    
Total Sources of Revenue 33,543 31,949
International Hospitals [Member]    
Disaggregation of Revenue [Line Items]    
Total Sources of Revenue 13,803 4,415
CardioGenesis [Member]    
Disaggregation of Revenue [Line Items]    
Total Sources of Revenue 1,345 1,585
International Distributor [Member]    
Disaggregation of Revenue [Line Items]    
Total Sources of Revenue $ 13,257 $ 7,110