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Segment Reporting and Foreign Operations - Sales by Business Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 21.00% |  |  |  | 11.00% |  |  |  | 21.00% | 11.00% | 6.00%
Net Sales | $ 190,897 | $ 179,337 | $ 186,549 | $ 171,069 | $ 157,715 | $ 156,975 | $ 151,071 | $ 138,077 | $ 727,852 | $ 603,838 | $ 542,149
Cardiovascular Segment |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 21.00% |  |  |  | 11.00% |  |  |  | 21.00% | 11.00% | 6.00%
Net Sales |  |  |  |  |  |  |  |  | $ 700,613 | $ 580,151 | $ 520,915
Cardiovascular Segment | Stand-alone devices |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 44.00% |  |  |  | 23.00% |  |  |  | 44.00% | 23.00% | 8.00%
Net Sales |  |  |  |  |  |  |  |  | $ 275,431 | $ 191,148 | $ 155,414
Cardiovascular Segment | Custom kits and procedure trays |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 6.00% |  |  |  | 2.00% |  |  |  | 6.00% | 2.00% | 5.00%
Net Sales |  |  |  |  |  |  |  |  | $ 126,114 | $ 119,226 | $ 116,368
Cardiovascular Segment | Inflation devices |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 8.00% |  |  |  | 1.00% |  |  |  | 8.00% | 1.00% | 1.00%
Net Sales |  |  |  |  |  |  |  |  | $ 79,875 | $ 73,916 | $ 73,373
Cardiovascular Segment | Catheters |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 13.00% |  |  |  | 17.00% |  |  |  | 13.00% | 17.00% | 11.00%
Net Sales |  |  |  |  |  |  |  |  | $ 127,747 | $ 113,367 | $ 96,833
Cardiovascular Segment | Embolization devices |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 8.00% |  |  |  | 2.00% |  |  |  | 8.00% | 2.00% | 3.00%
Net Sales |  |  |  |  |  |  |  |  | $ 49,532 | $ 46,035 | $ 45,025
Cardiovascular Segment | CRM/EP |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 15.00% |  |  |  | 8.00% |  |  |  | 15.00% | 8.00% | 3.00%
Net Sales |  |  |  |  |  |  |  |  | $ 41,914 | $ 36,459 | $ 33,902
Endoscopy Segment |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | $ 27,239 | $ 23,687 | $ 21,234
Endoscopy Segment | Endoscopy devices |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
% Change | 15.00% |  |  |  | 12.00% |  |  |  | 15.00% | 12.00% | 18.00%
Net Sales |  |  |  |  |  |  |  |  | $ 27,239 | $ 23,687 | $ 21,234

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