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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, 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 (loss) |  | 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 (loss) |  |  |  |  | 71,685
Net unrealized appreciation (depreciation) on marketable securities, net of tax |  |  |  |  | (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) |  |
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 (loss) |  | 53,951 |  |  | 53,951
Stock based compensation expense | $ 3,310 |  |  |  | 3,310
Net unrealized appreciation (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) |  |
Balance at Dec. 31, 2022 | $ 734,426 | 2,236,869 | $ (619,862) | (3,802) | 2,347,631
Balance (in shares) at Dec. 31, 2022 | 82,593 |  | (31,994) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  | (22,071) |  |  | (22,071)
Exercise of common stock options and vested employee stock awards | $ 57 |  |  |  | 57
Exercise of common stock options and vested employee stock awards (in shares) | 130 |  |  |  |
Employee income tax paid on vested equity awards |  |  | $ (585) |  | (585)
Employee income tax paid on vested equity awards (in shares) |  |  | (32) |  |
Sale of common stock under employee stock purchase plan | $ 1,218 |  |  |  | 1,218
Sale of common stock under employee stock purchase plan (in shares) | 78 |  |  |  |
Stock based compensation expense | $ 4,329 |  |  |  | 4,329
Treasury stock purchases |  |  | $ (100,001) |  | (100,001)
Treasury stock purchases (in shares) |  |  | (5,067) |  |
Net unrealized appreciation (depreciation) on marketable securities, net of tax |  |  |  | 1,480 | 1,480
Balance at Mar. 31, 2023 | $ 740,030 | 2,214,798 | $ (720,448) | (2,322) | 2,232,058
Balance (in shares) at Mar. 31, 2023 | 82,801 |  | (37,093) |  |
Balance at Dec. 31, 2022 | $ 734,426 | 2,236,869 | $ (619,862) | (3,802) | 2,347,631
Balance (in shares) at Dec. 31, 2022 | 82,593 |  | (31,994) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  |  |  |  | (6,652)
Net unrealized appreciation (depreciation) on marketable securities, net of tax |  |  |  |  | 2,994
Balance at Jun. 30, 2023 | $ 744,276 | 2,230,217 | $ (816,446) | (808) | 2,157,239
Balance (in shares) at Jun. 30, 2023 | 82,801 |  | (40,428) |  |
Balance at Mar. 31, 2023 | $ 740,030 | 2,214,798 | $ (720,448) | (2,322) | 2,232,058
Balance (in shares) at Mar. 31, 2023 | 82,801 |  | (37,093) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  | 15,419 |  |  | 15,419
Stock based compensation expense | $ 4,246 |  |  |  | 4,246
Treasury stock purchases |  |  | $ (95,998) |  | (95,998)
Treasury stock purchases (in shares) |  |  | (3,335) |  |
Net unrealized appreciation (depreciation) on marketable securities, net of tax |  |  |  | 1,514 | 1,514
Balance at Jun. 30, 2023 | $ 744,276 | $ 2,230,217 | $ (816,446) | $ (808) | $ 2,157,239
Balance (in shares) at Jun. 30, 2023 | 82,801 |  | (40,428) |  |

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