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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	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Total revenues	$ 136,978	$ 131,143
Net income (loss)	$ 14,552	$ (5,737)
Pro forma income (loss) per common share - basic	$ 0.45	$ (0.18)
Pro forma income (loss) per common share - diluted	$ 0.44	$ (0.18)
Pro forma tax rate	38.00%	38.00%

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Business Acquisition, Pro Forma, Tax Rate

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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