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Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 151,071 | $ 138,082 | $ 289,148 | $ 267,659
Operating income | 11,581 | 12,242 | 19,288 | 20,946
Cardiovascular Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 145,525 | 132,789 | 278,069 | 257,552
Operating income | 10,880 | 11,258 | 17,529 | 19,327
Endoscopy Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,546 | 5,293 | 11,079 | 10,107
Operating income | $ 701 | $ 984 | $ 1,759 | $ 1,619

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