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Acquisition Of On-X Life Technologies (Pro Forma Information) (Details) - On-X Agreement [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	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%

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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
-Paragraph 2
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