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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