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Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Total Sources of Revenue | $ 61,948 | $ 45,059
Domestic Hospitals [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Sources of Revenue | 33,543 | 31,949
International Hospitals [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Sources of Revenue | 13,803 | 4,415
CardioGenesis [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Sources of Revenue | 1,345 | 1,585
International Distributor [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total Sources of Revenue | $ 13,257 | $ 7,110

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