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Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Total revenues | $ 43,999 | $ 45,252 | $ 136,876 | $ 135,351
Total cost of products and preservation services | 14,137 | 15,470 | 44,597 | 47,647
Total gross margin | 29,862 | 29,782 | 92,279 | 87,704
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues |  |  | 0 |
Operating Segments [Member] | Medical Devices [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 27,029 | 28,004 | 84,519 | 85,067
Total cost of products and preservation services | 6,220 | 6,598 | 21,196 | 21,299
Total gross margin | 20,809 | 21,406 | 63,323 | 63,768
Operating Segments [Member] | Preservation Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 16,970 | 17,248 | 52,357 | 50,284
Total cost of products and preservation services | 7,917 | 8,872 | 23,401 | 26,348
Total gross margin | $ 9,053 | $ 8,376 | $ 28,956 | $ 23,936

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