Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 262,841	$ 189,702	$ 180,380
Domestic Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	138,432	128,240	123,885
International Hospitals [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	81,203	23,791	16,616
International Distributors [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	36,989	30,805	32,037
CardioGenesis Cardiac Laser Therapy [Member]
Disaggregation of Revenue [Line Items]
Total sources of revenue	$ 6,217	$ 6,866	$ 7,842

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration