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Summary Of Significant Accounting Policies (Schedule Of Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Interest | $ 2,561 | $ 2,446 | $ 1
Income taxes | 3,358 | 2,501 | $ 145
On-X [Member] |  |  |
Issuance of common stock for acquisition of intangible assets |  | $ 34,593 |
JOTEC [Member] |  |  |
Issuance of common stock for acquisition of intangible assets | $ 53,119 |  |

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