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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income | Treasury stock | Total
--- | --- | --- | --- | --- | --- | ---
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 |  | 17,098 |  |  |  | 17,098
Exercise of stock options | $ 4 | 13,971 |  |  |  | 13,975
Exercise of stock options (in shares) | 644 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 304 |  | 304
Repurchase of common stock |  |  |  |  | $ (579,948) | (579,948)
Repurchase of common stock (in shares) |  |  |  |  | (10,503) |
Foreign currency translation |  |  |  | (30,599) |  | (30,599)
Net income |  |  | 278,835 |  |  | 278,835
Balance at Mar. 31, 2020 | $ 3,186 | 4,428,580 | 5,301,315 | (62,682) | $ (5,799,453) | 3,870,946
Balance (in shares) at Mar. 31, 2020 | 637,104 |  |  |  | (110,265) |
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 |  |  |  |  |  |
Net income |  |  |  |  |  | 590,204
Balance at Jun. 30, 2020 | $ 3,190 | 4,474,379 | 5,612,684 | (53,438) | $ (5,815,275) | 4,221,540
Balance (in shares) at Jun. 30, 2020 | 637,924 |  |  |  | (110,563) |
Balance at Mar. 31, 2020 | $ 3,186 | 4,428,580 | 5,301,315 | (62,682) | $ (5,799,453) | 3,870,946
Balance (in shares) at Mar. 31, 2020 | 637,104 |  |  |  | (110,265) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 15,936 |  |  |  | 15,936
Exercise of stock options | $ 4 | 29,863 |  |  |  | 29,867
Exercise of stock options (in shares) | 820 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 200 |  | 200
Repurchase of common stock |  |  |  |  | $ (15,822) | (15,822)
Repurchase of common stock (in shares) |  |  |  |  | (298) |
Foreign currency translation |  |  |  | 9,044 |  | 9,044
Net income |  |  | 311,369 |  |  | 311,369
Balance at Jun. 30, 2020 | $ 3,190 | 4,474,379 | 5,612,684 | (53,438) | $ (5,815,275) | 4,221,540
Balance (in shares) at Jun. 30, 2020 | 637,924 |  |  |  | (110,563) |
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 |  | 17,949 |  |  |  | 17,949
Exercise of stock options | $ 3 | 6,758 |  |  |  | 6,761
Exercise of stock options (in shares) | 492 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 24 |  | 24
Repurchase of common stock |  |  |  |  | $ (13,419) | (13,419)
Repurchase of common stock (in shares) |  |  |  |  | (150) |
Foreign currency translation |  |  |  | (27,932) |  | (27,932)
Net income |  |  | 315,194 |  |  | 315,194
Balance at Mar. 31, 2021 | $ 3,196 | 4,562,689 | 6,747,268 | (24,874) | $ (5,828,842) | 5,459,437
Balance (in shares) at Mar. 31, 2021 | 639,154 |  |  |  | (110,715) |
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 |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  | 570
Net income |  |  |  |  |  | $ 718,956
Balance at Jun. 30, 2021 | $ 3,198 | 4,597,333 | 7,151,030 | (16,822) | $ (5,829,241) | 5,905,498
Balance (in shares) at Jun. 30, 2021 | 639,576 |  |  |  | (110,719) |
Balance at Mar. 31, 2021 | $ 3,196 | 4,562,689 | 6,747,268 | (24,874) | $ (5,828,842) | 5,459,437
Balance (in shares) at Mar. 31, 2021 | 639,154 |  |  |  | (110,715) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 16,921 |  |  |  | 16,921
Exercise of stock options | $ 2 | 17,723 |  |  |  | 17,725
Exercise of stock options (in shares) | 422 |  |  |  |  |
Unrealized loss, net on available-for-sale securities |  |  |  | (183) |  | (183)
Repurchase of common stock |  |  |  |  | $ (399) | (399)
Repurchase of common stock (in shares) |  |  |  |  | (4) |
Foreign currency translation |  |  |  | 8,235 |  | 8,235
Net income |  |  | 403,762 |  |  | 403,762
Balance at Jun. 30, 2021 | $ 3,198 | $ 4,597,333 | $ 7,151,030 | $ (16,822) | $ (5,829,241) | $ 5,905,498
Balance (in shares) at Jun. 30, 2021 | 639,576 |  |  |  | (110,719) |

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