Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 138,082	$ 128,865	$ 267,659	$ 248,101
Operating income	12,242	7,384	20,946	13,873
Cardiovascular Segment
Segment Reporting Information [Line Items]
Revenues	132,789	124,669	257,552	239,576
Operating income	11,258	7,300	19,327	13,696
Endoscopy Segment
Segment Reporting Information [Line Items]
Revenues	5,293	4,196	10,107	8,525
Operating income	$ 984	$ 84	$ 1,619	$ 177