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Segment Reporting - Sales by Business Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 128,808 | $ 115,210 | $ 376,909 | $ 329,033
Operating Income (Loss) | 12,076 | 8,391 | 25,949 | 16,928
Cardiovascular Segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 124,191 | 110,859 | 363,767 | 316,566
Operating Income (Loss) | 11,520 | 7,753 | 25,216 | 16,031
Endoscopy Segment |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 4,617 | 4,351 | 13,142 | 12,467
Operating Income (Loss) | $ 556 | $ 638 | $ 733 | $ 897

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