Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 276,222	$ 262,841	$ 189,702
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	144,538	138,432	128,240
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	85,241	81,203	23,791
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	40,427	36,989	30,805
Cardiogenesis [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 6,016	$ 6,217	$ 6,866