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Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 224,810 | $ 186,549 | $ 427,844 | $ 357,618
Operating income | 15,114 | 13,362 | 23,895 | 18,971
Cardiovascular |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 216,387 | 179,663 | 412,241 | 344,418
Operating income | 12,663 | 11,493 | 19,060 | 15,475
Endoscopy |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 8,423 | 6,886 | 15,603 | 13,200
Operating income | $ 2,451 | $ 1,869 | $ 4,835 | $ 3,496

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