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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
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Total revenues	$ 182,007
Net income (loss)	$ 17,692
Pro forma income (loss) per common share - basic	$ 0.54
Pro forma income (loss) per common share - diluted	$ 0.53
Pro forma tax rate	38.00%	38.00%	38.00%

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