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SELECTED QUARTERLY INFORMATION - UNAUDITED (Details) - USD ($) $ / shares in Units, $ 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
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue, net | $ 368,602 | $ 278,834 | $ 282,164 | $ 258,636 | $ 255,664 | $ 250,332 | $ 249,309 | $ 236,770 | $ 1,188,236 | $ 992,075 | $ 882,734
Gross margin | 220,431 | 177,077 | 183,166 | 172,051 | 170,242 | 161,003 | 159,744 | 151,997 | 752,725 | 642,986 |
Net income | $ 44,355 | $ 3,159 | $ 10,835 | $ 6,394 | $ 28,246 | $ 20,144 | $ 12,755 | $ 13,419 | $ 64,743 | $ 74,564 | $ (3,519)
Per Share-Basic (in dollars per share) | $ 0.57 | $ 0.04 | $ 0.14 | $ 0.09 | $ 0.38 | $ 0.27 | $ 0.17 | $ 0.18 | $ 0.84 | $ 1.00 | $ (0.05)
Per Share-Diluted (in dollars per share) | $ 0.56 | $ 0.04 | $ 0.14 | $ 0.08 | $ 0.35 | $ 0.25 | $ 0.16 | $ 0.18 | $ 0.82 | $ 0.94 | $ (0.05)
Tax benefit, re-measurement of net deferred tax liabilities, Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |  | $ 43,400 |  |
Codman Specialty Surgical | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business, included in other income, net |  |  |  |  |  |  |  |  | $ 2,600 |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income, restated to reflect the effect of adoption |  |  |  |  |  |  | $ 1,800 |  |  |  |

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