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Segment Reporting
9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting. We report our operations in two operating segments: cardiovascular and endoscopy. Our cardiovascular segment consists of cardiology and radiology medical device products which assist in diagnosing and treating coronary artery disease, peripheral vascular disease and other non-vascular diseases and includes embolotherapeutic, cardiac rhythm management ("CRM"), electrophysiology ("EP"), critical care, and interventional oncology and spine devices. Our endoscopy segment focuses on the gastroenterology, pulmonary and thoracic surgery specialties, with a portfolio consisting primarily of stents, dilation balloons, certain inflation devices, guidewires, and other disposable products. We evaluate the performance of our operating segments based on operating income. Financial information relating to our reportable operating segments and reconciliations to the consolidated totals for the three and nine-month periods ended September 30, 2018 and 2017, are as follows (in thousands):
Three Months Ended September 30, Nine Months Ended September 30, 
2018 2017 2018 2017 
Net Sales
Cardiovascular
$212,150 $172,723 $624,392 $517,140 
Endoscopy
9,509 6,614 25,112 19,815 
Total net sales
$221,659 $179,337 $649,504 $536,955 
Operating Income (Loss)
Cardiovascular
$18,199 $(1,207)$37,263 $14,239 
Endoscopy
2,862 2,086 7,692 5,611 
Total operating income
$21,061 $879 $44,955 $19,850