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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Change in accounting principle and other |  | $ (13,141) |  |  | $ (13,141)
Balance, as adjusted | $ 690,910 | 1,763,444 | $ (503,182) | $ (32) | 1,951,140
Balance at Dec. 31, 2018 | $ 690,910 | 1,776,585 | $ (503,182) | (32) | 1,964,281
Balance (in shares) at Dec. 31, 2018 | 81,239 |  | (29,851) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 88,181 |  |  | 88,181
Net unrealized depreciation on marketable securities, net of tax of $10 |  |  |  | $ 32 | 32
Exercise of common stock options and stock issued under equity award plan | $ 641 |  |  |  | 641
Exercise of common stock options and stock issued under equity award plan (in shares) | 521 |  |  |  |
Sale of common stock under employee stock purchase plan | $ 1,620 |  |  |  | 1,620
Sale of common stock under employee stock purchase plan (in shares) | 39 |  |  |  |
Stock-based compensation expense (forfeiture credit) associated with equity awards, net | $ (578) |  |  |  | (578)
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | $ (9,311) |  | (9,311)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  | (173) |  |
Treasury stock purchases |  |  | $ (25,000) |  | (25,000)
Treasury stock purchases (in shares) |  |  | (476) |  |
Cash dividends declared |  | (6,158) |  |  | (6,158)
Balance at Mar. 31, 2019 | $ 692,593 | 1,845,467 | $ (537,493) |  | 2,000,567
Balance (in shares) at Mar. 31, 2019 | 81,799 |  | (30,500) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Change in accounting principle and other |  | (11,639) |  |  | (11,639)
Balance, as adjusted | $ 686,806 | 2,067,540 | $ (590,971) |  | 2,163,375
Balance at Dec. 31, 2019 | $ 686,806 | 2,079,179 | $ (590,971) |  | 2,175,014
Balance (in shares) at Dec. 31, 2019 | 81,743 |  | (31,420) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 29,988 |  |  | 29,988
Exercise of common stock options and stock issued under equity award plan | $ 38 |  |  |  | 38
Exercise of common stock options and stock issued under equity award plan (in shares) | 287 |  |  |  |
Sale of common stock under employee stock purchase plan | $ 1,494 |  |  |  | 1,494
Sale of common stock under employee stock purchase plan (in shares) | 24 |  |  |  |
Stock-based compensation expense (forfeiture credit) associated with equity awards, net | $ 1,727 |  |  |  | 1,727
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | $ (6,165) |  | (6,165)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  | (108) |  |
Treasury stock purchases |  |  | $ (20,000) |  | (20,000)
Treasury stock purchases (in shares) |  |  | (386) |  |
Cash dividends declared |  | (7,019) |  |  | (7,019)
Balance at Mar. 31, 2020 | $ 690,065 | $ 2,090,509 | $ (617,136) |  | $ 2,163,438
Balance (in shares) at Mar. 31, 2020 | 82,054 |  | (31,914) |  |

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