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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) |  |  |  |  |

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