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Segment Reporting - Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Net sales | $ 203,035 | $ 171,069
Operating income | 8,781 | 5,609
Cardiovascular |  |
Segment Reporting Information [Line Items] |  |
Net sales | 195,855 | 164,754
Operating income | 6,397 | 3,981
Endoscopy |  |
Segment Reporting Information [Line Items] |  |
Net sales | 7,180 | 6,315
Operating income | $ 2,384 | $ 1,628

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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