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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME - USD ($) $ in Thousands | Total | Ordinary Shares | Additional Paid-in Capital | Other Undenominated Capital | Accumulated Other Comprehensive Loss | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2020 |  | 52,788,093 |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 1,850,236 | $ 4,580 | $ 617,104 | $ 1,134 | $ (35,477) | $ 1,262,895
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 153,185 |  |  |  |  | 153,185
Currency translation adjustment | (60,617) |  |  |  | (60,617) |
Actuarial gain on defined benefit pension plan | 4,266 |  |  |  | 4,266 |
Amortization of cash flow hedge | 113 |  |  |  | 113 |
Gain on cash flow hedge | 778 |  |  |  | 778 |
Total comprehensive income | 97,725 |  |  |  |  |
Exercise of share options (in shares) |  | 1,065,529 |  |  |  |
Exercise of share options | 118,589 | $ 77 | 118,512 |  |  |
Issue of restricted share units / performance share units (in shares) |  | 328,634 |  |  |  |
Issue of restricted share units / performance share units | 23 | $ 23 |  |  |  |
Share based compensation expense | 133,553 |  | 133,553 |  |  |
Share issuance costs | (853) |  | (853) |  |  |
Issue of shares associated with a business combination (in shares) |  | 27,372,427 |  |  |  |
Repurchase of ordinary shares | 5,658,155 | $ 1,960 | 5,656,195 |  |  |
Replacement share-based awards issued to acquiree employees | 209,399 |  | 209,399 |  |  |
Ending balance (in shares) at Dec. 31, 2021 |  | 81,554,683 |  |  |  |
Ending balance at Dec. 31, 2021 | 8,066,827 | $ 6,640 | 6,733,910 | 1,134 | (90,937) | 1,416,080
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 505,304 |  |  |  |  | 505,304
Currency translation adjustment | (89,530) |  |  |  | (89,530) |
Actuarial gain on defined benefit pension plan | 12,657 |  |  |  | 12,657 |
Amortization of cash flow hedge | 0 |  |  |  |  |
Gain on cash flow hedge | (3,728) |  |  |  | (3,728) |
Total comprehensive income | 424,703 |  |  |  |  |
Exercise of share options (in shares) |  | 348,286 |  |  |  |
Exercise of share options | 35,828 | $ 21 | 35,807 |  |  |
Issue of restricted share units / performance share units (in shares) |  | 241,116 |  |  |  |
Issue of restricted share units / performance share units | 16 | $ 16 |  |  |  |
Share based compensation expense | 70,606 |  | 70,606 |  |  |
Share issuance costs | (17) |  | (17) |  |  |
Repurchase of ordinary shares (in shares) |  | (420,530) |  |  |  |
Repurchase of ordinary shares | (99,983) | $ (28) |  | 28 |  | (99,983)
Share repurchase costs | $ (17) |  |  |  |  | (17)
Ending balance (in shares) at Dec. 31, 2022 | 81,723,555 | 81,723,555 |  |  |  |
Ending balance at Dec. 31, 2022 | $ 8,497,963 | $ 6,649 | 6,840,306 | 1,162 | (171,538) | 1,821,384
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 612,335 |  |  |  |  | 612,335
Currency translation adjustment | 26,221 |  |  |  | 26,221 |
Actuarial gain on defined benefit pension plan | 244 |  |  |  | 244 |
Amortization of cash flow hedge | 0 |  |  |  |  |
Gain on cash flow hedge | 1,567 |  |  |  | 1,567 |
Total comprehensive income | 640,367 |  |  |  |  |
Exercise of share options (in shares) |  | 535,705 |  |  |  |
Exercise of share options | 50,958 | $ 35 | 50,923 |  |  |
Issue of restricted share units / performance share units (in shares) |  | 235,826 |  |  |  |
Issue of restricted share units / performance share units | 15 | $ 15 |  |  |  |
Share based compensation expense | 51,456 |  | 51,456 |  |  |
Share issuance costs | $ (16) |  | (16) |  |  |
Ending balance (in shares) at Dec. 31, 2023 | 82,495,086 | 82,495,086 |  |  |  |
Ending balance at Dec. 31, 2023 | $ 9,240,743 | $ 6,699 | $ 6,942,669 | $ 1,162 | $ (143,506) | $ 2,433,719

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