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Acquisition Of On-X Life Technologies (Pro Forma Information) (Details) - On-X Agreement [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Total revenues | $ 182,007 | $ 179,266 |
Net income (loss) | $ 17,692 | $ (4,787) |
Pro forma income (loss) per common share - basic | $ 0.54 | $ (0.15) |
Pro forma income (loss) per common share - diluted | $ 0.53 | $ (0.15) |
Pro forma tax rate | 38.00% | 38.00% | 38.00%

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