Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 65,131	$ 67,881	$ 185,331	$ 206,525
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,249	36,627	102,813	108,582
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	20,764	20,246	56,638	63,204
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	8,035	9,654	25,522	29,773
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 83	$ 1,354	$ 358	$ 4,966