Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 253,227	$ 276,222	$ 262,841
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	137,810	144,538	138,432
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	80,524	85,241	81,203
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	34,429	40,427	36,989
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 464	$ 6,016	$ 6,217