Segment Reporting - Sales by Business Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue from External Customer [Line Items]
Revenues	$ 128,808	$ 115,210	$ 376,909	$ 329,033
Operating Income (Loss)	12,076	8,391	25,949	16,928
Cardiovascular Segment
Revenue from External Customer [Line Items]
Revenues	124,191	110,859	363,767	316,566
Operating Income (Loss)	11,520	7,753	25,216	16,031
Endoscopy Segment
Revenue from External Customer [Line Items]
Revenues	4,617	4,351	13,142	12,467
Operating Income (Loss)	$ 556	$ 638	$ 733	$ 897