Segment Reporting and Foreign Operations - Sales by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
% Change	6.00%				14.00%				6.00%	14.00%	14.00%
Revenues	$ 138,404	$ 136,086	$ 138,082	$ 129,577	$ 132,780	$ 128,808	$ 128,865	$ 119,236	$ 542,149	$ 509,689	$ 449,049
Cardiovascular Segment
Revenue from External Customer [Line Items]
% Change	6.00%				14.00%				6.00%	14.00%	14.00%
Revenues									$ 520,915	$ 491,706	$ 432,124
Cardiovascular Segment | Stand Alone Devices
Revenue from External Customer [Line Items]
% Change	8.00%				15.00%				8.00%	15.00%	10.00%
Revenues									$ 155,414	$ 143,712	$ 125,445
Cardiovascular Segment | Custom Kit And Procedures Trays
Revenue from External Customer [Line Items]
% Change	5.00%				7.00%				5.00%	7.00%	10.00%
Revenues									$ 116,368	$ 111,076	$ 103,700
Cardiovascular Segment | Inflation Devices
Revenue from External Customer [Line Items]
% Change	1.00%				10.00%				1.00%	10.00%	(4.00%)
Revenues									$ 73,373	$ 72,538	$ 66,182
Cardiovascular Segment | Catheters
Revenue from External Customer [Line Items]
% Change	11.00%				17.00%				11.00%	17.00%	16.00%
Revenues									$ 96,833	$ 87,550	$ 75,131
Cardiovascular Segment | Embolization Devices
Revenue from External Customer [Line Items]
% Change	3.00%				31.00%				3.00%	31.00%	(1.00%)
Revenues									$ 45,025	$ 43,855	$ 33,395
Cardiovascular Segment | Electrophysiology
Revenue from External Customer [Line Items]
% Change	3.00%				17.00%				3.00%	17.00%	1359.00%
Revenues									$ 33,902	$ 32,975	$ 28,271
Endoscopy Segment
Revenue from External Customer [Line Items]
Revenues									$ 21,234	$ 17,983	$ 16,925
Endoscopy Segment | Endoscopy Devices
Revenue from External Customer [Line Items]
% Change	18.00%				6.00%				18.00%	6.00%	7.00%
Revenues									$ 21,234	$ 17,983	$ 16,925