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Shareholders' Equity - Summary of Activities in Common Stock (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity [Abstract] |  |  |  |
Purchases of treasury shares | $ (12,975) | $ 0 | $ (12,975) | $ (15,482)
Purchases of treasury (in shares) | (32) | 0 | (32) | (59)
Exercise of stock options and vesting of restricted stock units | $ 11,286 | $ 46,101 | $ 29,388 | $ 92,337
Stock option exercises (in shares) | 89 | 436 | 210 | 917
Employee stock plan purchases | $ 3,162 | $ 2,708 | $ 6,200 | $ 5,177
Employee stock plan purchases (in shares) | 9 | 10 | 17 | 20
Restricted stock units vested, net of withheld shares upon award settlement | $ (7,052) | $ (4,591) | $ (16,010) | $ (6,892)
Restricted stock units vested, net of withheld shares upon award settlement (in shares) | 43 | 33 | 99 | 43

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