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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings | Treasury Stock | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2020 | $ 704,675 | $ 2,052,006 | $ (617,136) | $ 2,139,545
Balance (in shares) at Dec. 31, 2020 | 82,095 |  | (31,914) |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income |  | 35,900 |  | 35,900
Exercise of common stock options and vested employee stock awards | $ 606 |  |  | 606
Exercise of common stock options and vested employee stock awards (in shares) | 177 |  |  |
Employee income tax paid on vested equity awards |  |  | $ (1,573) | (1,573)
Employee income tax paid on vested equity awards (in shares) |  |  | (42) |
Sale of common stock under employee stock purchase plan | $ 1,139 |  |  | 1,139
Sale of common stock under employee stock purchase plan (in shares) | 30 |  |  |
Stock based compensation expense | $ 2,613 |  |  | 2,613
Warrants issued to U.S. Treasury | 3,291 |  |  | 3,291
Balance at Mar. 31, 2021 | $ 712,324 | 2,087,906 | $ (618,709) | 2,181,521
Balance (in shares) at Mar. 31, 2021 | 82,302 |  | (31,956) |
Balance at Dec. 31, 2021 | $ 722,310 | 2,163,916 | $ (618,712) | 2,267,514
Balance (in shares) at Dec. 31, 2021 | 82,336 |  | (31,956) |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Net income |  | 17,734 |  | 17,734
Exercise of common stock options and vested employee stock awards | $ 27 |  |  | 27
Exercise of common stock options and vested employee stock awards (in shares) | 139 |  |  |
Employee income tax paid on vested equity awards |  |  | $ (1,123) | (1,123)
Employee income tax paid on vested equity awards (in shares) |  |  | (37) |
Sale of common stock under employee stock purchase plan | $ 1,487 |  |  | 1,487
Sale of common stock under employee stock purchase plan (in shares) | 40 |  |  |
Stock based compensation expense | $ 4,076 |  |  | 4,076
Balance at Mar. 31, 2022 | $ 727,900 | $ 2,181,650 | $ (619,835) | $ 2,289,715
Balance (in shares) at Mar. 31, 2022 | 82,515 |  | (31,993) |

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