Segment Reporting and Foreign Operations - Sales by Business Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Revenues	$ 120,016	$ 115,210	$ 109,875	$ 103,948	$ 102,231	$ 95,907	$ 100,532	$ 95,618	$ 449,049	$ 394,288	$ 359,449
% Change	13.89%				10.00%				13.89%	10.00%		21.00%
Cardiovascular Segment
Revenue from External Customer [Line Items]
Revenues									432,124	378,493	347,430
% Change	14.17%				9.00%				14.17%	9.00%		21.00%
Cardiovascular Segment | Stand Alone Devices
Revenue from External Customer [Line Items]
Revenues									125,445	114,242	101,959
% Change	9.81%				12.05%				9.81%	12.05%		15.00%
Cardiovascular Segment | Custom Kit And Procedures Trays
Revenue from External Customer [Line Items]
Revenues									103,700	94,586	91,532
% Change	9.64%				3.34%				9.64%	3.34%		11.00%
Cardiovascular Segment | Inflation Devices
Revenue from External Customer [Line Items]
Revenues									66,182	68,979	67,353
% Change	(4.05%)				2.41%				(4.05%)	2.41%		8.00%
Cardiovascular Segment | Catheters
Revenue from External Customer [Line Items]
Revenues									75,131	64,878	55,357
% Change	15.80%				17.20%				15.80%	17.20%		23.00%
Cardiovascular Segment | Embolization Devices
Revenue from External Customer [Line Items]
Revenues									33,395	33,870	31,229
% Change	(1.40%)				8.46%				(1.40%)	8.46%		247.00%
Cardiovascular Segment | Electrophysiology
Revenue from External Customer [Line Items]
Revenues									28,271	1,938	0
% Change	1358.77%				0.00%				1358.77%	0.00%		0.00%
Endoscopy Segment
Revenue from External Customer [Line Items]
Revenues									16,925	15,795	12,019
Endoscopy Segment | Endoscopy Devices
Revenue from External Customer [Line Items]
Revenues									$ 16,925	$ 15,795	$ 12,019
% Change	7.15%				31.00%				7.15%	31.00%		33.00%