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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 30 Months Ended |
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Jul. 31, 2017 Segment | Dec. 21, 2016 shares | Dec. 15, 2016 shares | Oct. 25, 2016 $ / shares shares | Jul. 02, 2015 | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Mar. 31, 2015 Segment | Dec. 31, 2017 USD ($) Customer Segment $ / shares shares | Dec. 31, 2016 USD ($) Customer $ / shares shares | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2017 USD ($) Segment $ / shares shares | Oct. 24, 2016 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split ratio, Common stock |  | 2 |  | 2 |  |  |  |  |  |  |  |  |
Provision for doubtful accounts |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 400,000 | $ 1,000,000 |  |
Inventory, capitalized expenses |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | 36,100,000 | 31,200,000 | 27,000,000 |  |
Interest expense capitalized to property, plant, and equipment |  |  |  |  |  |  |  |  | $ 1,100,000 | 1,000,000 |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  | 3 | 2 |  |  | 2 |
Number of underlying reporting units | Segment | 3 |  |  |  |  |  |  |  | 3 |  |  |  |
Goodwill, impairment loss |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Impairment of indefinite-lived Assets |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | 52,800,000 | 41,500,000 | 32,200,000 |  |
Annual amortization expense expected to approximate in 2018 |  |  |  |  |  |  |  |  | 66,900,000 |  |  | $ 66,900,000 |
Annual amortization expense expected to approximate in 2019 |  |  |  |  |  |  |  |  | 66,800,000 |  |  | 66,800,000 |
Annual amortization expense expected to approximate in 2020 |  |  |  |  |  |  |  |  | 66,700,000 |  |  | 66,700,000 |
Annual amortization expense expected to approximate in 2021 |  |  |  |  |  |  |  |  | 65,700,000 |  |  | 65,700,000 |
Annual amortization expense expected to approximate in 2022 |  |  |  |  |  |  |  |  | 62,200,000 |  |  | 62,200,000 |
Annual amortization expense expected to approximate thereafter |  |  |  |  |  |  |  |  | 658,900,000 |  |  | 658,900,000 |
Charitable contributions |  |  |  |  |  |  |  |  | 500,000 | 0 | 900,000 |  |
Foreign currency transaction (loss) gain |  |  |  |  |  |  |  |  | $ (2,900,000) | 300,000 | (500,000) |  |
Number of days from shipment to issue a credit |  |  |  |  |  |  |  |  | 90 days |  |  |  |
Distribution and handling costs |  |  |  |  |  |  |  |  | $ 13,500,000 | 13,600,000 | 13,700,000 |  |
Extended warranties, in years (up to) |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Accrued warranty expense |  |  |  |  |  | $ 800,000 |  |  | $ 700,000 | $ 800,000 |  | $ 700,000 |
Common stock, shares authorized (in shares) | shares |  |  |  | 240,000,000.0 |  | 240,000,000 |  |  | 240,000,000 | 240,000,000 |  | 240,000,000 | 60,000,000.0
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |
Stock split, number of additional shares of common stock for each share held (in shares) | shares |  | 1 |  |  |  |  |  |  |  |  |  |  |
Fractional shares issued (in shares) | shares |  | 0 |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, contributions by employer |  |  |  |  |  |  |  |  | $ 450,000 |  | 1,800,000 |  |
Defined benefit plan, recognized net gain (loss) due to settlements and curtailments |  |  |  |  |  |  |  |  |  |  | (5,600,000) |  |
Pension contributions |  |  |  |  |  |  |  |  | 500,000 | $ 0 | 2,200,000 |  |
Payment of accreted interest |  |  |  |  |  |  |  |  | 0 | (42,786,000) | (384,000) |  |
Interest paid |  |  |  |  |  |  |  |  | 32,300,000 | 14,400,000 | 12,700,000 |  |
Interest paid, capitalized into construction in progress |  |  |  |  |  |  |  |  | 1,100,000 | 1,000,000 | 1,700,000 |  |
Stock issued during period, shares, conversion of convertible securities (in shares) | shares |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |
Treasury stock, cost |  |  |  |  |  | $ 123,100,000 |  |  | 121,600,000 | 123,100,000 |  | $ 121,600,000 |
Income taxes paid |  |  |  |  |  |  |  |  | 14,600,000 | 4,300,000 | 21,300,000 |  |
Property and equipment purchases included in liabilities |  |  |  |  |  |  |  |  | $ 7,800,000 | $ 4,700,000 | $ 4,700,000 |  |
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, number of customers over benchmark | Customer |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of convertible notes |  |  |  |  |  | $ 122,000,000 |  |  |  | $ 29,000 |  |  |
Stock issued during period, shares, conversion of convertible securities (in shares) | shares |  |  |  |  |  | 2,900,000 |  |  |  | 2,946,000 |  |  |
Exercise of warrants (in shares) | shares |  |  |  |  |  |  |  |  | 2,840,000 |  |  |  |
2016 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt |  |  |  |  |  | 1.625% |  |  |  | 1.625% | 1.625% |  |
Tarsus Medical, Inc. | Orthopedics and Tissue Technologies |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of finite-lived assets |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |  |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 400,000 |  |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, included in cost of product revenues |  |  |  |  |  |  |  |  | $ 35,700,000 | 27,600,000 | $ 22,300,000 |  |
Computer Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital leased assets, gross |  |  |  |  |  | $ 2,000,000 |  |  |  | 2,000,000 |  |  |
Capital leases, accumulated depreciation |  |  |  |  |  | $ 2,000,000 |  |  |  | $ 2,000,000 |  |  |
SeaSpine Inc. | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution of spinoff shares |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Shares of Integra for share of SeaSpine |  |  |  |  | 0.3333 |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercised (in shares) | shares |  |  |  |  |  |  |  |  | 8,707,202 |  |  |  |
Exercise of warrants (in shares) | shares |  |  |  |  |  |  |  |  | 2,839,743 |  |  |  |
Convertible Debt | 2016 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt |  |  | 1.625% |  |  |  |  |  |  |  |  |  |

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