Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 66,429	$ 67,505
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,336	35,611
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	19,737	20,570
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	10,245	9,610
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 111	$ 1,714