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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) reporting_unit | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of reporting units | reporting_unit | 3 |  |  |  |
Reporting unit, discount rate percentage | 9.00% |  |  |  |
Goodwill, impairment | $ 0 |  |  |  |
Impairment charge |  |  | $ 4,941,000 | $ 3,290,000 | $ 0
Amortization |  |  | 71,600,000 | 52,800,000 | 41,500,000
Expected annual amortization expense, 2019 |  |  | 66,200,000 |  |
Expected annual amortization expense, 2020 |  |  | 65,900,000 |  |
Expected annual amortization expense, 2021 |  |  | 64,800,000 |  |
Expected annual amortization expense, 2022 |  |  | 61,300,000 |  |
Expected annual amortization expense, 2023 |  |  | 60,400,000 |  |
Expected annual amortization expense, thereafter |  |  | 596,600,000 |  |
IPR&D |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of intangible assets, indefinite life |  |  | 0 | 0 |
Technology |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Amortization of product technology |  |  | 50,400,000 | $ 35,700,000 | $ 27,600,000
Codman |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets, indefinite life, discount rate percentage | 13.00% |  |  |  |
Codman | Trade name |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of intangible assets, indefinite life | $ 0 |  |  |  |
Metasurg | Orthopedics and Tissue Technologies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment charge | $ 4,900,000 |  |  |  |
Impairment charge, out of period adjustment included in original impairment |  |  | $ 2,500,000 |  |
Tarsus | Orthopedics and Tissue Technologies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment charge |  | $ 3,300,000 |  |  |

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