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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 3,155 | $ 4,238,170 | $ 3,914,645 | $ (32,864) | $ (4,512,205) | $ 3,610,901
Balance (in shares) at Dec. 31, 2018 | 630,970 |  |  |  | (87,294) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 63,356 |  |  |  | 63,356
Exercise of stock options | $ 27 | 92,336 |  |  |  | 92,363
Exercise of stock options (in shares) | 5,490 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 283 |  | 283
Adjustment to excess tax benefits from prior periods |  | 3,649 |  |  |  | 3,649
Repurchase of common stock |  |  |  |  | $ (707,300) | (707,300)
Repurchase of common stock (in shares) |  |  |  |  | (12,468) |
Foreign currency translation |  |  |  | 194 |  | 194
Net income |  |  | 1,107,835 |  |  | 1,107,835
Balance at Dec. 31, 2019 | $ 3,182 | 4,397,511 | 5,022,480 | (32,387) | $ (5,219,505) | 4,171,281
Balance (in shares) at Dec. 31, 2019 | 636,460 |  |  |  | (99,762) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 67,546 |  |  |  | 67,546
Exercise of stock options | $ 11 | 72,925 |  |  |  | 72,936
Exercise of stock options (in shares) | 2,202 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 110 |  | 110
Repurchase of common stock |  |  |  |  | $ (595,918) | (595,918)
Repurchase of common stock (in shares) |  |  |  |  | (10,803) |
Foreign currency translation |  |  |  | 35,531 |  | (35,531)
Net income |  |  | 1,409,594 |  |  | 1,409,594
Balance at Dec. 31, 2020 | $ 3,193 | 4,537,982 | 6,432,074 | 3,034 | $ (5,815,423) | 5,160,860
Balance (in shares) at Dec. 31, 2020 | 638,662 |  |  |  | (110,565) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 68,922 |  |  |  | 68,922
Exercise of stock options | $ 7 | 45,716 |  |  |  | 45,723
Exercise of stock options (in shares) | 1,381 |  |  |  |  |
Unrealized loss, net on available-for-sale securities |  |  |  | (1,041) |  | (1,041)
Repurchase of common stock |  |  |  |  | $ (13,830) | (13,830)
Repurchase of common stock (in shares) |  |  |  |  | (155) |
Foreign currency translation |  |  |  | (71,158) |  | (71,158)
Net income |  |  | 1,377,475 |  |  | 1,377,475
Balance at Dec. 31, 2021 | $ 3,200 | $ 4,652,620 | $ 7,809,549 | $ (69,165) | $ (5,829,253) | $ 6,566,951
Balance (in shares) at Dec. 31, 2021 | 640,043 |  |  |  | (110,720) |

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