Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 53,771	$ 71,139	$ 120,200	$ 138,644
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	30,228	36,344	66,564	71,955
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	16,135	22,532	35,872	43,102
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	7,244	10,365	17,489	19,975
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 164	$ 1,898	$ 275	$ 3,612