Segment Reporting - Operating Income (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of Operating Segments | segment			2
Segment Reporting Information [Line Items]
Net Sales (1)	$ 179,337	$ 156,975	$ 536,955	$ 446,123
Operating Income (Loss)	879	2,987	19,850	22,274
Cardiovascular Segment
Segment Reporting Information [Line Items]
Net Sales (1)	172,723	150,503	517,140	428,571
Operating Income (Loss)	(1,207)	1,858	14,239	19,385
Endoscopy Segment
Segment Reporting Information [Line Items]
Net Sales (1)	6,614	6,472	19,815	17,552
Operating Income (Loss)	$ 2,086	$ 1,129	$ 5,611	$ 2,889