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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, 2016 | $ 657,353 | $ 1,103,751 | $ (410,090) | $ (71) | $ 1,350,943
Balance (in shares) at Dec. 31, 2016 | 79,781 |  | (28,015) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  | 428,907 |  |  | 428,907
Net unrealized appreciation on marketable securities, net of taxes |  |  |  | 21 | 21
Exercise of common stock options and stock issued under equity award plan | $ 1,658 |  |  |  | 1,658
Exercise of common stock options and stock issued under equity award plan (in shares) | 529 |  |  |  |
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | $ (5,080) |  | (5,080)
Treasury shares acquired from vested employee stock awards for income tax withholdings (in shares) |  |  | (145) |  |
Sale of common stock under employee stock purchase plan | $ 3,002 |  |  |  | 3,002
Sale of common stock under employee stock purchase plan (in shares) | 88 |  |  |  |
Stock based compensation expense related to the issuance of equity awards | $ 10,580 |  |  |  | 10,580
Impact of adoption of ASU 2016-09 (See Note 1) | Accounting Standards Update 2016-09 |  | 867 |  |  | 867
Treasury stock purchases |  |  | $ (20,008) |  | (20,008)
Treasury stock purchases (in shares) |  |  | (484) |  |
Cash dividends declared |  | (16,568) |  |  | (16,568)
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 |  | 280,372 |  |  | 280,372
Net unrealized appreciation on marketable securities, net of taxes |  |  |  | 18 | 18
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 |  |  |  |
Treasury shares acquired from vested employee stock awards for income tax withholdings |  |  | $ (13,556) |  | (13,556)
Treasury 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 related to the issuance of equity awards | $ 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 | 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 |  |  |  |  |
Change in accounting principle and other (see Note 6) | Accounting Standards Update 2016-02 |  | (13,141) |  |  | (13,141)
Balance, as adjusted |  | 1,763,444 |  |  | 1,951,140
Net income |  | 340,099 |  |  | 340,099
Net unrealized appreciation on marketable securities, net of taxes |  |  |  | $ 32 | 32
Exercise of common stock options and stock issued under equity award plan | $ 3,106 |  |  |  | 3,106
Exercise of common stock options and stock issued under equity award plan (in shares) | 707 |  |  |  |
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) |  |
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 related to the issuance of equity awards | $ 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 | $ 2,079,179 | $ (590,971) |  | $ 2,175,014
Balance (in shares) at Dec. 31, 2019 | 81,743 |  | (31,420) |  |

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