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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock Cumulative Effect, Period of Adoption, as Adjusted | Common Stock | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, as Adjusted | Retained Earnings | Treasury Stock Cumulative Effect, Period of Adoption, as Adjusted | Treasury Stock | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, as Adjusted | Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, as Adjusted | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 672,593 |  |  | $ 1,516,957 |  | $ (435,178) |  | $ (50) |  |  | $ 1,754,322
Balance (in shares) at Dec. 31, 2017 |  | 80,398 |  |  |  |  | (28,644) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 280,372 |  |  |  |  |  |  | 280,372
Net unrealized appreciation on marketable securities, net of tax |  |  |  |  |  |  |  |  | 18 |  |  | 18
Exercise of common stock options and vested restricted stock units |  | $ 2,174 |  |  |  |  |  |  |  |  |  | 2,174
Exercise of common stock options and vested restricted stock units (in shares) |  | 780 |  |  |  |  |  |  |  |  |  |
Shares acquired from vested employee stock awards for income tax withholdings |  |  |  |  |  |  | $ (13,556) |  |  |  |  | (13,556)
Shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  |  |  |  |  | (239) |  |  |  |  |
Sale of common stock under employee stock purchase plan |  | $ 3,038 |  |  |  |  |  |  |  |  |  | 3,038
Sale of common stock under employee stock purchase plan (in shares) |  | 61 |  |  |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 13,105 |  |  |  |  |  |  |  |  |  | 13,105
Treasury stock purchases |  |  |  |  |  |  | $ (54,448) |  |  |  |  | (54,448)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (968) |  |  |  |  |
Cash dividends declared |  |  |  |  | (20,744) |  |  |  |  |  |  | (20,744)
Balance at Dec. 31, 2018 | $ 690,910 | $ 690,910 | $ (13,141) | $ 1,763,444 | 1,776,585 | $ (503,182) | $ (503,182) | $ (32) | (32) | $ (13,141) | $ 1,951,140 | 1,964,281
Balance (in shares) at Dec. 31, 2018 | 81,239 | 81,239 |  |  |  | (29,851) | (29,851) |  |  |  |  |
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 restricted stock units |  | $ 3,106 |  |  |  |  |  |  |  |  |  | 3,106
Exercise of common stock options and vested restricted stock units (in shares) |  | 707 |  |  |  |  |  |  |  |  |  |
Shares acquired from vested employee stock awards for income tax withholdings |  |  |  |  |  |  | $ (9,313) |  |  |  |  | (9,313)
Shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  |  |  |  |  | (173) |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |
Treasury stock purchases |  |  |  |  |  |  | $ (78,476) |  |  |  |  | (78,476)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (1,396) |  |  |  |  |
Cash dividends declared |  |  |  |  | (24,364) |  |  |  |  |  |  | (24,364)
Balance at Dec. 31, 2019 | $ 686,806 | $ 686,806 | $ (11,639) | $ 2,067,540 | 2,079,179 | $ (590,971) | $ (590,971) |  |  | $ (11,639) | $ 2,163,375 | 2,175,014
Balance (in shares) at Dec. 31, 2019 | 81,743 | 81,743 |  |  |  | (31,420) | (31,420) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (8,515) |  |  |  |  |  |  | (8,515)
Exercise of common stock options and vested restricted stock units |  | $ 38 |  |  |  |  |  |  |  |  |  | 38
Exercise of common stock options and vested restricted stock units (in shares) |  | 287 |  |  |  |  |  |  |  |  |  |
Shares acquired from vested employee stock awards for income tax withholdings |  |  |  |  |  |  | $ (6,165) |  |  |  |  | (6,165)
Shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  |  |  |  |  | (108) |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Stock based compensation expense |  | $ 6,802 |  |  |  |  |  |  |  |  |  | 6,802
Treasury stock purchases |  |  |  |  |  |  | $ (20,000) |  |  |  |  | (20,000)
Treasury stock purchases (in shares) |  |  |  |  |  |  | (386) |  |  |  |  |
Cash dividends declared |  |  |  |  | (7,019) |  |  |  |  |  |  | (7,019)
Warrants issued under CARES Act agreements |  | 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 |  |  |  |  | (31,914) |  |  |  |  |

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