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Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 68,496 | $ 47,818 | $ 130,444 | $ 92,877
Total cost of products and preservation services | 22,645 | 14,913 | 45,365 | 30,460
Total gross margin | 45,851 | 32,905 | 85,079 | 62,417
Operating Segments [Member] | Medical Devices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 49,313 | 30,094 | 92,911 | 57,490
Total cost of products and preservation services | 13,550 | 6,959 | 27,707 | 14,976
Total gross margin | 35,763 | 23,135 | 65,204 | 42,514
Operating Segments [Member] | Preservation Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 19,183 | 17,724 | 37,533 | 35,387
Total cost of products and preservation services | 9,095 | 7,954 | 17,658 | 15,484
Total gross margin | $ 10,088 | $ 9,770 | $ 19,875 | $ 19,903

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