Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 136,086	$ 128,808	$ 403,745	$ 376,909
Operating income	8,547	12,076	29,493	25,949
Cardiovascular Segment
Segment Reporting Information [Line Items]
Revenues	130,957	124,191	388,507	363,767
Operating income	7,995	11,520	27,323	25,216
Endoscopy Segment
Segment Reporting Information [Line Items]
Revenues	5,129	4,617	15,238	13,142
Operating income	$ 552	$ 556	$ 2,170	$ 733