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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) shares in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) Customer reporting_unit Segment | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) Customer shares | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Provision for doubtful accounts |  | $ 2,100,000 | $ 600,000 | $ 2,000,000.0 |  |
Inventory, capitalized expenses |  | 0 | 0 |  |  |
Depreciation expense |  | 42,600,000 | 44,100,000 | 36,100,000 |  |
Interest expense capitalized to property, plant, and equipment |  | $ 3,100,000 | 2,300,000 |  |  |
Number of reportable segments | Segment |  | 2 |  |  |  |
Number of reporting units | reporting_unit |  | 3 |  |  |  |
Contributions to Integra Foundation |  | $ 300,000 | 800,000 | 500,000 |  |
Foreign currency transaction loss |  | 300,000 | 1,700,000 | 2,900,000 |  |
Increase to opening retained earnings | $ 398,574,000 | 398,574,000 | 348,373,000 |  |  |
Increase to total assets | 3,303,240,000 | 3,303,240,000 | 3,107,887,000 |  |  |
Increase to total liabilities | 1,886,504,000 | 1,886,504,000 | 1,732,091,000 |  |  |
Lease liabilities | 109,757,000 | 109,757,000 |  |  |  |
Right of use asset - operating leases | 94,530,000 | 94,530,000 |  |  |  |
Interest paid |  | 48,900,000 | 58,300,000 | 32,300,000 |  |
Interest paid, capitalized into construction in progress |  | 3,100,000 | 2,300,000 | 1,100,000 |  |
Income taxes paid |  | 16,200,000 | 10,400,000 | 14,600,000 |  |
In-process research and development |  | 64,916,000 | 0 | 0 |  |
Property and equipment purchases included in liabilities |  | 11,000,000.0 | $ 5,400,000 | $ 7,800,000 |  |
Rebound |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Development milestone payment, to be paid | 5,000,000.0 | $ 5,000,000.0 |  |  |  |
In-process research and development | $ 5,000,000.0 |  |  |  |  |
Convertible Debt |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock issued, exercise of warrants (in shares) | shares |  |  |  | 2.8 |  |
Warrants exercised (in shares) | shares |  |  |  | 8.7 |  |
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% |  |
Accounting Standards Update 2014-09 | Adjustment Resulting from Adoption of Topic 606 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to total assets |  |  |  |  |  | $ 7,100,000
Increase to total liabilities |  |  |  |  |  | 5,200,000
Accounting Standards Update 2014-09 | Private Label | Adjustment Resulting from Adoption of Topic 606 | Transferred over Time |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to opening retained earnings |  |  |  |  |  | $ 1,900,000
Accounting Standards Update 2016-02 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease liabilities |  |  |  |  | $ 76,400,000 |
Right of use asset - operating leases |  |  |  |  | $ 67,300,000 |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Manufacturing period for products shipped with no alternative use and right of payment for performance |  | 1 month |  |  |  |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Manufacturing period for products shipped with no alternative use and right of payment for performance |  | 3 months |  |  |  |

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