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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
--- | --- | --- | --- | --- | ---
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 |  | $ 213,266 |  |  | 213,266
Net unrealized depreciation on marketable securities, net of taxes |  |  |  | 32 | 32
Exercise of common stock options and stock issued under equity award plan | $ 2,174 |  |  |  | 2,174
Exercise of common stock options and stock issued under equity award plan (in shares) | 780 |  |  |  |
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 associated with equity awards, net of forfeitures | $ 10,363 |  |  |  | 10,363
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | (25,164) |  | (25,164)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  | (428) |  |  |
Treasury stock purchases |  |  | (13,556) |  | (13,556)
Treasury stock purchases (in shares) |  | (239) |  |  |
Cash dividends declared |  | $ (15,602) |  |  | (15,602)
Balance at Sep. 30, 2018 | $ 688,168 | $ 1,714,621 | (473,898) | (18) | 1,928,873
Balance (in shares) at Sep. 30, 2018 | 81,239 | (29,311) |  |  |
Balance at Jun. 30, 2018 | $ 682,546 | $ 1,636,768 | (458,645) | (17) | 1,860,652
Balance (in shares) at Jun. 30, 2018 | 81,105 | (29,059) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | $ 83,046 |  |  | 83,046
Net unrealized depreciation on marketable securities, net of taxes |  |  |  | (1) | (1)
Exercise of common stock options and stock issued under equity award plan | $ 1,338 |  |  |  | 1,338
Exercise of common stock options and stock issued under equity award plan (in shares) | 103 |  |  |  |
Sale of common stock under employee stock purchase plan | $ 1,553 |  |  |  | 1,553
Sale of common stock under employee stock purchase plan (in shares) | 31 |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures | $ 2,731 |  |  |  | 2,731
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | (15,161) |  | (15,161)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  | (250) |  |  |
Treasury stock purchases |  |  | (92) |  | (92)
Treasury stock purchases (in shares) |  | (2) |  |  |
Cash dividends declared |  | $ (5,193) |  |  | (5,193)
Balance at Sep. 30, 2018 | $ 688,168 | $ 1,714,621 | (473,898) | (18) | 1,928,873
Balance (in shares) at Sep. 30, 2018 | 81,239 | (29,311) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Change in accounting principle and other (see Note 6) |  | $ (13,141) |  |  | (13,141)
Balance at December 31, 2018, 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 |  | 267,572 |  |  | 267,572
Net unrealized depreciation on marketable securities, net of taxes |  |  |  | $ 32 | 32
Exercise of common stock options and stock issued under equity award plan | $ 3,105 |  |  |  | 3,105
Exercise of common stock options and stock issued under equity award plan (in shares) | 707 |  |  |  |
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 associated with equity awards, net of forfeitures | $ 3,506 |  |  |  | 3,506
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | $ (9,313) |  | (9,313)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  | (173) |  |
Treasury stock purchases |  |  | $ (68,477) |  | (68,477)
Treasury stock purchases (in shares) |  |  | (1,229) |  |
Common stock purchased and cancelled | $ (16,145) |  |  |  | (16,145)
Common stock purchased and cancelled (in shares) | (268) |  |  |  |
Cash dividends declared |  | (18,325) |  |  | (18,325)
Balance at Sep. 30, 2019 | $ 684,541 | 2,012,691 | $ (580,972) |  | 2,116,260
Balance (in shares) at Sep. 30, 2019 | 81,743 |  | (31,253) |  |
Balance at Jun. 30, 2019 | $ 680,802 | 1,927,412 | $ (555,969) |  | 2,052,245
Balance (in shares) at Jun. 30, 2019 | 81,703 |  | (30,811) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 91,339 |  |  | 91,339
Exercise of common stock options and stock issued under equity award plan | $ 185 |  |  |  | 185
Exercise of common stock options and stock issued under equity award plan (in shares) | 13 |  |  |  |
Sale of common stock under employee stock purchase plan | $ 1,545 |  |  |  | 1,545
Sale of common stock under employee stock purchase plan (in shares) | 27 |  |  |  |
Stock-based compensation expense associated with equity awards, net of forfeitures | $ 2,009 |  |  |  | 2,009
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | $ (25,003) |  | (25,003)
Treasury stock purchases (in shares) |  |  | (442) |  |
Cash dividends declared |  | (6,060) |  |  | (6,060)
Balance at Sep. 30, 2019 | $ 684,541 | $ 2,012,691 | $ (580,972) |  | $ 2,116,260
Balance (in shares) at Sep. 30, 2019 | 81,743 |  | (31,253) |  |

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