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SEGMENT AND GEOGRAPHIC INFORMATION (Net Sales and Profit by Reportable 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
Segment Net Sales |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 368,602 | $ 278,834 | $ 282,164 | $ 258,636 | $ 255,664 | $ 250,332 | $ 249,309 | $ 236,770 | $ 1,188,236 | $ 992,075 | $ 882,734
Segment Profit |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 44,804 | 115,340 | 79,587
Amortization |  |  |  |  |  |  |  |  | (20,370) | (13,862) | (9,953)
Codman Specialty Surgical |  |  |  |  |  |  |  |  |  |  |
Segment Net Sales |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 720,301 | 632,524 | 586,918
Orthopedics and Tissue Technologies |  |  |  |  |  |  |  |  |  |  |
Segment Net Sales |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 467,935 | 359,551 | 295,816
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Profit |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 422,668 | 360,481 | 330,323
Operating Segments | Codman Specialty Surgical |  |  |  |  |  |  |  |  |  |  |
Segment Profit |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 292,971 | 256,629 | 242,479
Operating Segments | Orthopedics and Tissue Technologies |  |  |  |  |  |  |  |  |  |  |
Segment Profit |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 129,697 | 103,852 | 87,844
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Segment Profit |  |  |  |  |  |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  | (20,370) | (13,862) | (9,953)
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Profit |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | $ (357,494) | $ (231,279) | $ (240,783)

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