Segment Reporting and Foreign Operations - Sales by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
% Change	11.00%				6.00%				11.00%	6.00%	14.00%
Net Sales	$ 157,715	$ 156,975	$ 151,071	$ 138,077	$ 138,404	$ 136,086	$ 138,082	$ 129,577	$ 603,838	$ 542,149	$ 509,689
Cardiovascular Segment
Revenue from External Customer [Line Items]
% Change	11.00%				6.00%				11.00%	6.00%	14.00%
Net Sales									$ 580,248	$ 520,915	$ 491,706
Cardiovascular Segment | Stand Alone Devices
Revenue from External Customer [Line Items]
% Change	25.00%				8.00%				25.00%	8.00%	15.00%
Net Sales									$ 193,517	$ 155,414	$ 143,712
Cardiovascular Segment | Custom Kit And Procedures Trays
Revenue from External Customer [Line Items]
% Change	3.00%				5.00%				3.00%	5.00%	7.00%
Net Sales									$ 119,392	$ 116,368	$ 111,076
Cardiovascular Segment | Inflation Devices
Revenue from External Customer [Line Items]
% Change	1.00%				1.00%				1.00%	1.00%	10.00%
Net Sales									$ 73,919	$ 73,373	$ 72,538
Cardiovascular Segment | Catheters
Revenue from External Customer [Line Items]
% Change	15.00%				11.00%				15.00%	11.00%	17.00%
Net Sales									$ 110,939	$ 96,833	$ 87,550
Cardiovascular Segment | Embolization Devices
Revenue from External Customer [Line Items]
% Change	2.00%				3.00%				2.00%	3.00%	31.00%
Net Sales									$ 46,035	$ 45,025	$ 43,855
Cardiovascular Segment | Electrophysiology
Revenue from External Customer [Line Items]
% Change	8.00%				3.00%				8.00%	3.00%	17.00%
Net Sales									$ 36,446	$ 33,902	$ 32,975
Endoscopy Segment
Revenue from External Customer [Line Items]
Net Sales									$ 23,590	$ 21,234	$ 17,983
Endoscopy Segment | Endoscopy Devices
Revenue from External Customer [Line Items]
% Change	11.00%				18.00%				11.00%	18.00%	6.00%
Net Sales									$ 23,590	$ 21,234	$ 17,983