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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Income [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2015 |  | 28,653 |  |  |
Beginning Balance at Dec. 31, 2015 | $ 442,590 | $ 28 | $ 145,366 | $ (1,851) | $ 299,047
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) |  | 615 |  |  |
Issuance of common stock under employee stock option and stock award plans | 8,479 |  | 8,479 |  |
Repurchase of common stock (in shares) |  | (146) |  |  |
Repurchase of common stock | (6,435) |  | (6,435) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 128 |  |  |
Issuance of common stock under employee stock purchase plan | 4,580 |  | 4,580 |  |
Stock-based compensation expense related to employee stock options and awards | 19,599 |  | 19,599 |  |
Stock-based compensation expense related to employee stock purchases | 1,286 |  | 1,286 |  |
Payment of dividends to stockholders | (15,054) |  |  |  | (15,054)
Unrealized actuarial gain (loss) on pension benefits | (352) |  |  | (352) |
Unrealized gain (loss) on marketable securities, | (123) |  |  | (123) |
Translation adjustment | (384) |  |  | (384) |
Net income (loss) | 48,898 |  |  |  | 48,898
Ending Balance (in shares) at Dec. 31, 2016 |  | 29,250 |  |  |
Ending Balance at Dec. 31, 2016 | 503,084 | $ 28 | 172,875 | (2,710) | 332,891
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | ASU 2016-09 | 7,542 |  |  |  | 7,542
Issuance of common stock under employee stock option and stock award plans (in shares) |  | 569 |  |  |
Issuance of common stock under employee stock option and stock award plans |  | $ 1 |  |  |
Issuance of common stock under employee stock option and stock award plans | 5,087 |  | 5,086 |  |
Repurchase of common stock (in shares) |  | (129) |  |  |
Repurchase of common stock | (9,188) |  | (9,188) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 92 |  |  |
Issuance of common stock under employee stock purchase plan | 4,934 |  | 4,934 |  |
Stock-based compensation expense related to employee stock options and awards | 23,337 |  | 23,337 |  |
Stock-based compensation expense related to employee stock purchases | 1,340 |  | 1,340 |  |
Payment of dividends to stockholders | (16,634) |  |  |  | (16,634)
Unrealized actuarial gain (loss) on pension benefits | 699 |  |  | 699 |
Unrealized gain (loss) on marketable securities, | (207) |  |  | (207) |
Translation adjustment | 79 |  |  | 79 |
Net income (loss) | 27,609 |  |  |  | 27,609
Ending Balance (in shares) at Dec. 31, 2017 |  | 29,782 |  |  |
Ending Balance at Dec. 31, 2017 | 547,682 | $ 29 | 198,384 | (2,139) | 351,408
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) |  | 591 |  |  |
Issuance of common stock under employee stock option and stock award plans | 4,010 |  | 4,010 |  |
Repurchase of common stock (in shares) |  | (1,572) |  |  |
Repurchase of common stock | (103,154) | $ (1) | (103,153) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 88 |  |  |
Issuance of common stock under employee stock purchase plan | 5,343 |  | 5,343 |  |
Stock-based compensation expense related to employee stock options and awards | 20,027 |  | 20,027 |  |
Stock-based compensation expense related to employee stock purchases | 1,553 |  | 1,553 |  |
Payment of dividends to stockholders | (18,823) |  |  |  | (18,823)
Unrealized actuarial gain (loss) on pension benefits | 525 |  |  | 525 |
Unrealized gain (loss) on marketable securities, | 161 |  |  | 161 |
Translation adjustment | (236) |  |  | (236) |
Net income (loss) | 69,984 |  |  |  | 69,984
Ending Balance (in shares) at Dec. 31, 2018 |  | 28,889 |  |  |
Ending Balance at Dec. 31, 2018 | $ 527,072 | $ 28 | $ 126,164 | $ (1,689) | $ 402,569

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