Segment Reporting and Foreign Operations - Sales by Business Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Revenues	$ 102,231	$ 95,907	$ 100,532	$ 95,618	$ 91,092	$ 90,477	$ 91,249	$ 86,631	$ 394,288	$ 359,449	$ 296,755
% Change	9.69233%				21.00%				9.69233%	21.00%	15.00%
Cardiovascular Segment [Member]
Revenue from External Customer [Line Items]
Revenues									378,493	347,430	287,707
% Change	8.94079%				21.00%				8.94079%	21.00%	15.00%
Cardiovascular Segment [Member] | Stand Alone Devices [Member]
Revenue from External Customer [Line Items]
Revenues									114,242	101,959	88,586
% Change	12.047%				15.00%				12.047%	15.00%	16.00%
Cardiovascular Segment [Member] | Custom Kit And Procedures Trays [Member]
Revenue from External Customer [Line Items]
Revenues									94,586	91,532	82,799
% Change	3.33654%				11.00%				3.33654%	11.00%	11.00%
Cardiovascular Segment [Member] | Inflation Devices [Member]
Revenue from External Customer [Line Items]
Revenues									68,979	67,353	62,495
% Change	2.41415%				8.00%				2.41415%	8.00%	2.00%
Cardiovascular Segment [Member] | Catheters [Member]
Revenue from External Customer [Line Items]
Revenues									64,878	55,357	44,824
% Change	17.19927%				23.00%				17.19927%	23.00%	18.00%
Cardiovascular Segment [Member] | Embolization Devices [Member]
Revenue from External Customer [Line Items]
Revenues									33,870	31,229	9,003
% Change	8.45688%				246.87326%				8.45688%	246.87326%	0.00%
Cardiovascular Segment [Member] | Electrophysiology [Member]
Revenue from External Customer [Line Items]
Revenues									1,938	0	0
% Change	0.00%				0.00%				0.00%	0.00%	0.00%
Endoscopy Segment [Member]
Revenue from External Customer [Line Items]
Revenues									15,795	12,019	9,048
Endoscopy Segment [Member] | Endoscopy Devices [Member]
Revenue from External Customer [Line Items]
Revenues									$ 15,795	$ 12,019	$ 9,048
% Change	31.41692%				33.00%				31.41692%	33.00%	18.00%