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Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 156,975 | $ 136,086 | $ 446,123 | $ 403,745
Operating income | 2,987 | 8,547 | 22,274 | 29,493
Cardiovascular Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 150,599 | 130,957 | 428,668 | 388,507
Operating income | 1,954 | 7,995 | 19,482 | 27,323
Endoscopy Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6,376 | 5,129 | 17,455 | 15,238
Operating income | $ 1,033 | $ 552 | $ 2,792 | $ 2,170

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