Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 80,340	$ 76,148	$ 157,553	$ 147,235
Domestic hospitals
Disaggregation of Revenue [Line Items]
Total sources of revenue	39,508	38,932	76,501	75,161
International hospitals
Disaggregation of Revenue [Line Items]
Total sources of revenue	27,235	27,638	55,649	53,765
International distributors
Disaggregation of Revenue [Line Items]
Total sources of revenue	12,152	9,504	23,216	18,146
CardioGenesis cardiac laser therapy
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 1,445	$ 74	$ 2,187	$ 163