Segment Reporting - Sales by Business Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue from External Customer [Line Items]
Revenues	$ 128,865	$ 109,875	$ 248,101	$ 213,823
Operating Income (Loss)	7,384	6,780	13,873	8,537
Cardiovascular Segment
Revenue from External Customer [Line Items]
Revenues	124,669	105,953	239,576	205,707
Operating Income (Loss)	7,300	6,649	13,696	8,277
Endoscopy Segment
Revenue from External Customer [Line Items]
Revenues	4,196	3,922	8,525	8,116
Operating Income (Loss)	$ 84	$ 131	$ 177	$ 260