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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings
--- | --- | --- | --- | ---
Balance at Dec. 31, 2019 |  | $ 824,953 | $ 1,161 |  | $ 574,955 | $ 248,837
Balance, shares at Dec. 31, 2019 |  |  | 116,052,000 |  |  |
Vesting of restricted stock units |  |  | $ 6 |  | (6) |
Vesting of restricted stock units, shares |  |  | 579,000 |  |  |
Stock-based compensation expense |  | 3,254 |  |  | 3,254 |
Exercise of stock options |  | 398 |  |  | 398 |
Exercise of stock options, shares |  |  | 82,000 |  |  |
Shares withheld for restricted stock units vested |  | (3,834) | $ (2) |  | (3,832) |
Shares withheld for restricted stock units vested, shares |  |  | (168,000) |  |  |
Net income |  | 8,767 |  |  |  | 8,767
Balance at Mar. 31, 2020 |  | 833,538 | $ 1,165 |  | 574,769 | 257,604
Balance, shares at Mar. 31, 2020 |  |  | 116,545,000 |  |  |
Balance at Dec. 31, 2019 |  | 824,953 | $ 1,161 |  | 574,955 | 248,837
Balance, shares at Dec. 31, 2019 |  |  | 116,052,000 |  |  |
Net income |  | 173,623 |  |  |  |
Balance at Sep. 30, 2020 |  | 1,007,865 | $ 1,168 |  | 584,237 | 422,460
Balance, shares at Sep. 30, 2020 |  |  | 116,803,000 |  |  |
Balance at Mar. 31, 2020 |  | 833,538 | $ 1,165 |  | 574,769 | 257,604
Balance, shares at Mar. 31, 2020 |  |  | 116,545,000 |  |  |
Vesting of restricted stock units |  |  | $ 2 |  | (2) |
Vesting of restricted stock units, shares |  |  | 130,000 |  |  |
Stock-based compensation expense |  | 3,466 |  |  | 3,466 |
Exercise of stock options |  | 325 |  |  | 325 |
Exercise of stock options, shares |  |  | 48,000 |  |  |
Shares withheld for restricted stock units vested |  | (319) |  |  | (319) |
Shares withheld for restricted stock units vested, shares |  |  | (22,000) |  |  |
Net income |  | 78,924 |  |  |  | 78,924
Balance at Jun. 30, 2020 |  | 915,934 | $ 1,167 |  | 578,239 | 336,528
Balance, shares at Jun. 30, 2020 |  |  | 116,701,000 |  |  |
Vesting of restricted stock units, shares |  |  | 13,000 |  |  |
Stock-based compensation expense |  | 5,379 |  |  | 5,379 |
Exercise of stock options |  | 620 | $ 1 |  | 619 |
Exercise of stock options, shares |  |  | 89,000 |  |  |
Net income |  | 85,932 |  |  |  | 85,932
Balance at Sep. 30, 2020 |  | 1,007,865 | $ 1,168 |  | 584,237 | 422,460
Balance, shares at Sep. 30, 2020 |  |  | 116,803,000 |  |  |
Balance at Dec. 31, 2020 |  | $ 1,152,783 | $ 1,168 |  | 589,241 | 562,374
Balance, shares at Dec. 31, 2020 |  | 116,829,000 | 116,829,000 |  |  |
Merger consideration |  | $ 3,658,362 | $ 896 |  | 3,657,466 |
Merger consideration, shares |  |  | 89,586,000 |  |  |
Vesting of restricted stock units |  |  | $ 6 |  | (6) |
Vesting of restricted stock units, shares |  |  | 648,000 |  |  |
Stock-based compensation expense |  | 10,402 |  |  | 10,402 |
Exercise of stock options |  | 235 | $ 1 |  | 234 |
Exercise of stock options, shares |  |  | 27,000 |  |  |
Shares withheld for restricted stock units vested |  | (10,417) | $ (2) |  | (10,415) |
Shares withheld for restricted stock units vested, shares |  |  | (232,000) |  |  |
Net income |  | 172,580 |  |  |  | 172,580
Balance at Mar. 31, 2021 |  | 4,983,945 | $ 2,069 |  | 4,246,922 | 734,954
Balance, shares at Mar. 31, 2021 |  |  | 206,858,000 |  |  |
Balance at Dec. 31, 2020 |  | $ 1,152,783 | $ 1,168 |  | 589,241 | 562,374
Balance, shares at Dec. 31, 2020 |  | 116,829,000 | 116,829,000 |  |  |
Repurchase of common stock |  | $ (578,200) |  |  |  |
Repurchase of common stock, shares |  | (10,958,400) |  |  |  |
Net income |  | $ 1,282,960 |  |  |  |
Balance at Sep. 30, 2021 |  | $ 5,523,426 | $ 1,963 |  | 4,254,262 | 1,267,201
Balance, shares at Sep. 30, 2021 |  | 196,288,000 | 196,288,000 |  |  |
Balance at Mar. 31, 2021 |  | $ 4,983,945 | $ 2,069 |  | 4,246,922 | 734,954
Balance, shares at Mar. 31, 2021 |  |  | 206,858,000 |  |  |
Vesting of restricted stock units |  |  | $ 5 |  | (5) |
Vesting of restricted stock units, shares |  |  | 472,000 |  |  |
Stock-based compensation expense |  | 8,465 |  |  | 8,465 |
Exercise of stock options |  | 99 |  |  | 99 |
Exercise of stock options, shares |  |  | 16,000 |  |  |
Shares withheld for restricted stock units vested |  | (7,289) | $ (2) |  | (7,287) |
Shares withheld for restricted stock units vested, shares |  |  | (150,000) |  |  |
Net income |  | 497,235 |  |  |  | 497,235
Balance at Jun. 30, 2021 |  | 5,482,455 | $ 2,072 |  | 4,248,194 | 1,232,189
Balance, shares at Jun. 30, 2021 |  |  | 207,196,000 |  |  |
Vesting of restricted stock units, shares |  |  | 38,000 |  |  |
Stock-based compensation expense |  | 6,421 |  |  | 6,421 |
Repurchase of common stock | [1] | $ (578,242) | $ (109) |  |  | (578,133)
Repurchase of common stock, shares |  | (10,958,400) | (10,958,000) | [1] |  |
Exercise of stock options |  | $ 202 |  |  | 202 |
Exercise of stock options, shares |  |  | 22,000 |  |  |
Shares withheld for restricted stock units vested |  | (555) |  |  | (555) |
Shares withheld for restricted stock units vested, shares |  |  | (10,000) |  |  |
Net income |  | 613,145 |  |  |  | 613,145
Balance at Sep. 30, 2021 |  | $ 5,523,426 | $ 1,963 |  | $ 4,254,262 | $ 1,267,201
Balance, shares at Sep. 30, 2021 |  | 196,288,000 | 196,288,000 |  |  |
[1] | During the three and nine months ended September 30, 2021 we repurchased and retired 10,958,400 shares of our common stock at an average price of $52.74 per share for $578.2 million, net of fees, pursuant to the repurchase program authorized by our board of directors in August 2021.

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