Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 71,139	$ 68,496	$ 138,644	$ 130,444
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,344	35,139	71,955	68,682
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	22,532	21,902	43,102	40,951
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	1,898	1,578	3,612	2,924
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 10,365	$ 9,877	$ 19,975	$ 17,887