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Acquisition Of On-X Life Technologies (Preliminary Pro Forma Information) (Details) - On-X Agreement [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Business Acquisition [Line Items] |  |
Total revenues | $ 44,643 | $ 41,612
Net income | $ 5,661 | $ (12,447)
Pro forma income per common share-basic | $ 0.17 | $ (0.39)
Pro forma income per common share-diluted | $ 0.17 | $ (0.39)
Pro forma tax rate | 38.00% | 38.00%

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