Segment Reporting - Operating Income (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of Operating Segments | segment			2
Segment Reporting Information [Line Items]
Net Sales	$ 186,549	$ 151,071	$ 357,618	$ 289,148
Operating income	13,362	11,581	18,971	19,288
Cardiovascular Segment
Segment Reporting Information [Line Items]
Net Sales	179,734	145,525	344,521	278,069
Operating income	11,545	10,880	15,549	17,529
Endoscopy Segment
Segment Reporting Information [Line Items]
Net Sales	6,815	5,546	13,097	11,079
Operating income	$ 1,817	$ 701	$ 3,422	$ 1,759