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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDER'S EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Treasury Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2019     88,735,000            
Balance, Beginning of Period at Dec. 31, 2019 $ 1,416,736 $ (200) $ 887 $ (119,943) $ 1,213,620   $ (76,401) $ 398,573 $ (200)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2019       (2,865,000)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 9,180             9,180  
Other comprehensive income (loss), net of tax (28,187)           (28,187)    
Issuance of common stock through employee stock purchase plan (in shares)     13,000            
Issuance of common stock through employee stock purchase plan 694       694        
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)     357,000 10,000          
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (2,739)   $ 2 $ 476 (3,217)        
Share-based compensation 3,781       3,781        
Share repurchase and equity component of the convertible note issuance, net (in shares)       (135,000)          
Share repurchase and equity component of the convertible note issuance, net 34,906     $ (7,632) 42,538        
Accelerated shares repurchased (in shares)       (1,304,000)          
Accelerated shares repurchased (92,368)     $ (75,407) (16,961)        
Balance End of Period, Shares (in shares) at Mar. 31, 2020     89,105,000            
Balance, End of Period at Mar. 31, 2020 1,341,803   $ 889 $ (202,506) 1,240,455   (104,588) 407,553  
Balance, End of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2020       (4,294,000)          
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2019     88,735,000            
Balance, Beginning of Period at Dec. 31, 2019 $ 1,416,736 (200) $ 887 $ (119,943) 1,213,620   (76,401) 398,573 (200)
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2019       (2,865,000)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Accelerated shares repurchased (in shares) (2,100,000)                
Balance End of Period, Shares (in shares) at Dec. 31, 2020     89,251,000            
Balance, End of Period at Dec. 31, 2020 $ 1,514,867 $ (66,046) $ 893 $ (235,141) 1,290,908 $ (63,274) (74,059) 532,266 $ (2,772)
Balance, End of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2020 (4,914,000)     (4,914,000)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Accounting Standards Update [Extensible List] iart:AccountingStandardsUpdate202006Member                
Net income $ 45,394             45,394  
Other comprehensive income (loss), net of tax 30,432           30,432    
Issuance of common stock through employee stock purchase plan (in shares)     18,000            
Issuance of common stock through employee stock purchase plan 1,127       1,127        
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)     137,000 15,000          
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (2,541)   $ 1 $ 680 (3,222)        
Share-based compensation 6,098       6,098        
Balance End of Period, Shares (in shares) at Mar. 31, 2021     89,406,000            
Balance, End of Period at Mar. 31, 2021 $ 1,529,331   $ 894 $ (234,461) $ 1,231,637   $ (43,627) $ 574,888  
Balance, End of Period, Treasury Stock, Shares (in shares) at Mar. 31, 2021 (4,899,000)     (4,899,000)