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Summary Of Significant Accounting Policies (Schedule Of Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest | $ 15,005 | $ 2,561 | $ 2,446
Income taxes | $ 1,699 | 3,358 | 2,501
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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