Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 71,087	$ 66,429
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,229	36,336
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	26,128	19,737
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	8,642	10,245
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 88	$ 111