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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, 2015 | $ 641,643 | $ 1,275,142 | $ (410,090) | $ (260) | $ 1,506,435 |
Balance (in shares) at Dec. 31, 2015 | 79,020 |  | (28,015) |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  | (161,586) |  |  | (161,586) | [1]
Net unrealized appreciation on marketable securities, net of taxes |  |  |  | 189 | 189 | [1]
Exercise of common stock options and vested restricted stock units | $ 4,979 |  |  |  | 4,979 |
Exercise of common stock options and vested restricted stock units (in shares) | 609 |  |  |  |  |
Sale of common stock under employee stock purchase plan | $ 3,163 |  |  |  | 3,163 |
Sale of common stock under employee stock purchase plan (in shares) | 152 |  |  |  |  |
Stock based compensation expense related to the issuance of stock options and restricted stock units | $ 7,568 |  |  |  | 7,568 |
Cash dividends declared (per share) |  | (9,805) |  |  | (9,805) |
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 | [1]
Net unrealized appreciation on marketable securities, net of taxes |  |  |  | 21 | 21 | [1]
Exercise of common stock options and vested restricted stock units | $ 1,658 |  |  |  | 1,658 |
Exercise of common stock options and vested restricted stock units (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 stock options and restricted stock units | $ 10,580 |  |  |  | 10,580 |
Impact of adoption of Accounting Standards Update (ASU) 2016-09 (See Note 1) |  | 867 |  |  | 867 |
Treasury stock purchases |  |  | $ (20,008) |  | (20,008) |
Treasury stock purchases (in shares) |  |  | (484) |  |  |
Cash dividends declared (per share) |  | (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 vested restricted stock units | $ 2,174 |  |  |  | 2,174 |
Exercise of common stock options and vested restricted stock units (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 stock options and restricted stock units | $ 13,105 |  |  |  | 13,105 |
Treasury stock purchases |  |  | $ (54,448) |  | (54,448) |
Treasury stock purchases (in shares) |  |  | (968) |  |  |
Cash dividends declared (per share) |  | (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) |  |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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