Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 67,881	$ 64,598	$ 206,525	$ 195,042
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,627	34,924	108,582	103,606
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	20,246	19,001	63,204	56,440
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	1,354	1,590	4,966	4,514
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 9,654	$ 9,083	$ 29,773	$ 30,482