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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 04, 2020
USD ($)
$ / shares
May 31, 2019
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Segment
Customer
reporting_unit
Dec. 31, 2019
USD ($)
Customer
Dec. 31, 2018
USD ($)
Customer
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]                    
Provision for doubtful accounts         $ 3,600,000 $ 2,100,000 $ 600,000      
Inventory, capitalized expenses         0 0        
Depreciation expense         42,100,000 42,600,000 44,100,000      
Write off of construction in progress     $ 6,700,000              
Interest expense capitalized into property, plant, and equipment         $ 2,300,000 3,100,000        
Number of reportable segments | Segment         2          
Number of reporting units | reporting_unit         3          
Contributions to Integra Foundation         $ 800,000 300,000 800,000      
Foreign currency transaction loss         1,600,000 300,000 1,700,000      
Increase to opening retained earnings     1,514,867,000 $ 1,416,736,000 1,514,867,000 1,416,736,000 1,375,796,000     $ 962,306,000
Increase to total assets     3,615,136,000 3,303,240,000 3,615,136,000 3,303,240,000        
Increase to total liabilities     2,100,269,000 1,886,504,000 2,100,269,000 1,886,504,000        
Restructuring costs     6,400,000   6,400,000          
Defer payment and taxation, base salary, percentage (up to)   75.00%                
Defer payment and taxation, bonus and other eligible cash compensation, percentage (up to)   100.00%                
Lease liabilities     100,936,000 109,757,000 100,936,000 109,757,000        
Right of use asset - operating leases     83,635,000 94,530,000 83,635,000 94,530,000        
Interest paid         47,300,000 48,900,000 58,300,000      
Interest paid, capitalized into construction in progress         2,300,000 3,100,000 2,300,000      
Income taxes paid         29,800,000 16,200,000 10,400,000      
In-process research and development         0 64,916,000 0      
Property and equipment purchases included in liabilities         1,600,000 11,000,000.0 5,400,000      
Cost of call transactions         104,248,000 0 0      
Proceeds from warrant transactions         44,563,000 0 $ 0      
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    
Cost of goods sold                    
Summary Of Significant Accounting Policies [Line Items]                    
Restructuring costs incurred         4,900,000          
Selling, general and administrative                    
Summary Of Significant Accounting Policies [Line Items]                    
Restructuring costs incurred         1,200,000          
Research and development                    
Summary Of Significant Accounting Policies [Line Items]                    
Restructuring costs incurred         300,000          
Convertible Debt | 2025 Notes                    
Summary Of Significant Accounting Policies [Line Items]                    
Debt, aggregate principal amount issued $ 575,000,000.0   575,000,000.0   575,000,000.0          
Debt, interest rate 0.50%                  
Debt, initial conversion rate 13.5739                  
Initial conversion price (in dollars per share) | $ / shares $ 73.67                  
Warrant strike price (in dollars per share) | $ / shares 113.34                  
Convertible Debt | 2025 Notes | Call Option                    
Summary Of Significant Accounting Policies [Line Items]                    
Cost of call transactions         104,200,000          
Proceeds from warrant transactions         44,500,000          
Initial strike price (in dollars per share) | $ / shares $ 73.67                  
Rebound                    
Summary Of Significant Accounting Policies [Line Items]                    
Development milestone payment, to be paid     20,000,000.0 5,000,000.0 $ 20,000,000.0 5,000,000.0        
In-process research and development       5,000,000.0   $ 5,000,000.0        
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%      
Retained Earnings                    
Summary Of Significant Accounting Policies [Line Items]                    
Increase to opening retained earnings     532,266,000 398,574,000 $ 532,266,000 $ 398,574,000 $ 348,373,000     $ 285,186,000
Cumulative Effect, Period of Adoption, Adjustment                    
Summary Of Significant Accounting Policies [Line Items]                    
Increase to opening retained earnings       (200,000)   (200,000)        
Increase to total assets                 $ 7,100,000  
Increase to total liabilities                 5,200,000  
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings                    
Summary Of Significant Accounting Policies [Line Items]                    
Increase to opening retained earnings       $ (200,000)   $ (200,000)     $ 1,900,000  
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          
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Smith & Nephew USD Limited                    
Summary Of Significant Accounting Policies [Line Items]                    
Inventories     52,845,000   $ 52,845,000          
Property, plant and equipment, net     $ 37,893,000   $ 37,893,000