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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Loss | 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, 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 |  |  |  |  | 107,578
Balance at Sep. 30, 2021 | $ 720,932 | 2,159,584 | $ (618,709) |  | 2,261,807
Balance (in shares) at Sep. 30, 2021 | 82,336 |  | (31,956) |  |
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) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 61,994 |  |  | 61,994
Stock based compensation expense | $ 2,877 |  |  |  | 2,877
Warrants issued to U.S. Treasury | 2,513 |  |  |  | 2,513
Balance at Jun. 30, 2021 | $ 717,714 | 2,149,900 | $ (618,709) |  | 2,248,905
Balance (in shares) at Jun. 30, 2021 | 82,302 |  | (31,956) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 9,684 |  |  | 9,684
Sale of common stock under employee stock purchase plan | $ 1,401 |  |  |  | 1,401
Sale of common stock under employee stock purchase plan (in shares) | 34 |  |  |  |
Stock based compensation expense | $ 1,817 |  |  |  | 1,817
Balance at Sep. 30, 2021 | $ 720,932 | 2,159,584 | $ (618,709) |  | 2,261,807
Balance (in shares) at Sep. 30, 2021 | 82,336 |  | (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) |  |
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 |  |  |  |  | 120,057
Net unrealized depreciation on marketable securities, net of tax |  |  |  |  | (4,569)
Balance at Sep. 30, 2022 | $ 736,406 | 2,283,973 | $ (619,862) | $ (4,569) | 2,395,948
Balance (in shares) at Sep. 30, 2022 | 82,592 |  | (31,994) |  |
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) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 53,951 |  |  | 53,951
Stock based compensation expense | $ 3,310 |  |  |  | 3,310
Net unrealized depreciation on marketable securities, net of tax |  |  |  | (1,945) | (1,945)
Balance at Jun. 30, 2022 | $ 731,210 | 2,235,601 | $ (619,835) | (1,945) | 2,345,031
Balance (in shares) at Jun. 30, 2022 | 82,515 |  | (31,993) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 48,372 |  |  | 48,372
Exercise of common stock options and vested employee stock awards | $ 115 |  |  |  | 115
Exercise of common stock options and vested employee stock awards (in shares) | 11 |  |  |  |
Employee income tax paid on vested equity awards |  |  | $ (27) |  | (27)
Employee income tax paid on vested equity awards (in shares) |  |  | (1) |  |
Sale of common stock under employee stock purchase plan | $ 1,329 |  |  |  | 1,329
Sale of common stock under employee stock purchase plan (in shares) | 66 |  |  |  |
Stock based compensation expense | $ 3,752 |  |  |  | 3,752
Net unrealized depreciation on marketable securities, net of tax |  |  |  | (2,624) | (2,624)
Balance at Sep. 30, 2022 | $ 736,406 | $ 2,283,973 | $ (619,862) | $ (4,569) | $ 2,395,948
Balance (in shares) at Sep. 30, 2022 | 82,592 |  | (31,994) |  |

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