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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] Cumulative Effect, Period of Adoption, as Adjusted | Common Stock [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member] Cumulative Effect, Period of Adoption, as Adjusted | Retained Earnings [Member] | Treasury Stock [Member] Cumulative Effect, Period of Adoption, as Adjusted | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, as Adjusted | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, as Adjusted | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Change in accounting principle and other |  |  | $ (13,141) |  |  |  |  |  |  | $ (13,141) |  |
Balance at Dec. 31, 2018 | $ 690,910 | $ 690,910 |  | $ 1,763,444 | $ 1,776,585 | $ (503,182) | $ (503,182) | $ (32) | $ (32) |  | $ 1,951,140 | $ 1,964,281
Balance (in shares) at Dec. 31, 2018 | 81,239,000 | 81,239,000 |  |  |  | (29,851,000) | (29,851,000) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 340,099 |  |  |  |  |  |  | 340,099
Net unrealized appreciation on marketable securities, net of tax |  |  |  |  |  |  |  |  | $ 32 |  |  | 32
Exercise of common stock options and vested employee stock awards |  | $ 3,106 |  |  |  |  |  |  |  |  |  | $ 3,106
Exercise of common stock options and vested employee stock awards (in shares) |  | 707,000 |  |  |  |  |  |  |  |  |  | 232,514
Employee income tax paid on vested equity awards |  |  |  |  |  |  | $ (9,313) |  |  |  |  | $ (9,313)
Employee income tax paid on vested equity awards (in shares) |  |  |  |  |  |  | (173,000) |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 3,165 |  |  |  |  |  |  |  |  |  | 3,165
Sale of common stock under employee stock purchase plan (in shares) |  | 65,000 |  |  |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 5,770 |  |  |  |  |  |  |  |  |  | 5,770
Common stock purchased and cancelled |  | $ (16,145) |  |  |  |  |  |  |  |  |  | (16,145)
Common stock purchased and cancelled (in shares) |  | (268,000) |  |  |  |  |  |  |  |  |  |
Treasury stock purchases |  |  |  |  |  |  | $ (78,476) |  |  |  |  | (78,476)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (1,396,000) |  |  |  |  |
Cash dividends declared |  |  |  |  | (24,364) |  |  |  |  |  |  | (24,364)
Balance at Dec. 31, 2019 | $ 686,806 | $ 686,806 |  | $ 2,067,540 | 2,079,179 | $ (590,971) | $ (590,971) |  |  |  | $ 2,163,375 | 2,175,014
Balance (in shares) at Dec. 31, 2019 | 81,743,000 | 81,743,000 |  |  |  | (31,420,000) | (31,420,000) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Change in accounting principle and other |  |  | $ (11,639) |  |  |  |  |  |  | $ (11,639) |  |
Net income (loss) |  |  |  |  | (8,515) |  |  |  |  |  |  | (8,515)
Exercise of common stock options and vested employee stock awards |  | $ 38 |  |  |  |  |  |  |  |  |  | $ 38
Exercise of common stock options and vested employee stock awards (in shares) |  | 287,000 |  |  |  |  |  |  |  |  |  | 2,578
Employee income tax paid on vested equity awards |  |  |  |  |  |  | $ (6,165) |  |  |  |  | $ (6,165)
Employee income tax paid on vested equity awards (in shares) |  |  |  |  |  |  | (108,000) |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 2,781 |  |  |  |  |  |  |  |  |  | 2,781
Sale of common stock under employee stock purchase plan (in shares) |  | 65,000 |  |  |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 6,802 |  |  |  |  |  |  |  |  |  | 6,802
Treasury stock purchases |  |  |  |  |  |  | $ (20,000) |  |  |  |  | (20,000)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (386,000) |  |  |  |  |
Cash dividends declared |  |  |  |  | (7,019) |  |  |  |  |  |  | (7,019)
Warrants issued to U.S. Treasury |  | 8,248 |  |  |  |  |  |  |  |  |  | 8,248
Balance at Dec. 31, 2020 |  | $ 704,675 |  |  | 2,052,006 |  | $ (617,136) |  |  |  |  | 2,139,545
Balance (in shares) at Dec. 31, 2020 |  | 82,095,000 |  |  |  |  | (31,914,000) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 111,910 |  |  |  |  |  |  | 111,910
Exercise of common stock options and vested employee stock awards |  | $ 606 |  |  |  |  |  |  |  |  |  | $ 606
Exercise of common stock options and vested employee stock awards (in shares) |  | 177,000 |  |  |  |  |  |  |  |  |  | 41,020
Employee income tax paid on vested equity awards |  |  |  |  |  |  | $ (1,576) |  |  |  |  | $ (1,576)
Employee income tax paid on vested equity awards (in shares) |  |  |  |  |  |  | (42,000) |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 2,540 |  |  |  |  |  |  |  |  |  | 2,540
Sale of common stock under employee stock purchase plan (in shares) |  | 64,000 |  |  |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 8,685 |  |  |  |  |  |  |  |  |  | 8,685
Warrants issued to U.S. Treasury |  | 5,804 |  |  |  |  |  |  |  |  |  | 5,804
Balance at Dec. 31, 2021 |  | $ 722,310 |  |  | $ 2,163,916 |  | $ (618,712) |  |  |  |  | $ 2,267,514
Balance (in shares) at Dec. 31, 2021 |  | 82,336,000 |  |  |  |  | (31,956,000) |  |  |  |  |

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