Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 156,975	$ 136,086	$ 446,123	$ 403,745
Operating income	2,987	8,547	22,274	29,493
Cardiovascular Segment
Segment Reporting Information [Line Items]
Revenues	150,599	130,957	428,668	388,507
Operating income	1,954	7,995	19,482	27,323
Endoscopy Segment
Segment Reporting Information [Line Items]
Revenues	6,376	5,129	17,455	15,238
Operating income	$ 1,033	$ 552	$ 2,792	$ 2,170