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Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 136,086 | $ 128,808 | $ 403,745 | $ 376,909
Operating income | 8,547 | 12,076 | 29,493 | 25,949
Cardiovascular Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 130,957 | 124,191 | 388,507 | 363,767
Operating income | 7,995 | 11,520 | 27,323 | 25,216
Endoscopy Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,129 | 4,617 | 15,238 | 13,142
Operating income | $ 552 | $ 556 | $ 2,170 | $ 733

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