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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, 2014 | $ 626,521 | $ 1,165,478 | $ (391,364) | $ (289) | $ 1,400,346
Balance (in shares) at Dec. 31, 2014 | 77,951 |  | (26,765) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) |  | 117,817 |  |  | 117,817
Net unrealized appreciation on marketable securities net of tax |  |  |  | 29 | 29
Exercise of common stock options and vested restricted stock units | $ 8,490 |  |  |  | 8,490
Exercise of common stock options and vested restricted stock units (in shares) | 815 |  |  |  |
Sale of common stock under employee stock purchase plan | $ 3,430 |  |  |  | 3,430
Sale of common stock under employee stock purchase plan (in shares) | 254 |  |  |  |
Stock based compensation expense related to the issuance of stock options and restricted stock units | $ 5,368 |  |  |  | 5,368
Tax deficiency from exercise of common stock options | (2,166) |  |  |  | (2,166)
Treasury stock purchases |  |  | $ (18,726) |  | (18,726)
Treasury stock purchases (in shares) |  |  | (1,250) |  |
Cash dividends declared (per share) |  | (8,153) |  |  | (8,153)
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 (loss) |  | (161,586) |  |  | (161,586)
Net unrealized appreciation on marketable securities net of tax |  |  |  | 189 | 189
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 (loss) |  | 428,907 |  |  | 428,907
Net unrealized appreciation on marketable securities net of tax |  |  |  | 21 | 21
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 withheld for the payment of taxes |  |  | $ (5,080) |  | (5,080)
Treasury shares withheld for the payment of taxes (in shares) |  |  | (145) |  |
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 | $ 3,002 |  |  |  | 3,002
Impact of adoption of Accounting Standards Update (ASU) 2016-09 (See Note 1) |  | 867 |  |  | 867
Tax deficiency from exercise of common stock options | 10,580 |  |  |  | 10,580
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) |  |

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