Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 138,077	$ 129,577
Operating income	7,706	8,704
Cardiovascular Segment
Segment Reporting Information [Line Items]
Revenues	132,544	124,764
Operating income	6,648	8,069
Endoscopy Segment
Segment Reporting Information [Line Items]
Revenues	5,533	4,813
Operating income	$ 1,058	$ 635