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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]
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | ASU 2014-09 | $ 13,966 |  |  |  | $ 13,966
Beginning Balance (in shares) at Dec. 31, 2014 |  | 29,208 |  |  |
Beginning Balance at Dec. 31, 2014 | 430,676 | $ 29 | $ 171,938 | $ (1,136) | 259,845
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) |  | 578 |  |  |
Issuance of common stock under employee stock option and stock award plans | 8,133 |  | 8,133 |  |
Repurchase of common stock (in shares) |  | (1,250) |  |  |
Repurchase of common stock | (53,731) | $ (1) | (53,730) |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 117 |  |  |
Issuance of common stock under employee stock purchase plan | 4,447 |  | 4,447 |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | (189) |  | (189) |  |
Stock-based compensation expense related to employee stock options and awards | 13,562 |  | 13,562 |  |
Stock-based compensation expense related to employee stock purchases | 1,205 |  | 1,205 |  |
Payment of dividends to stockholders | (13,916) |  |  |  | (13,916)
Unrealized actuarial gain (loss) on pension benefits | (344) |  |  | (344) |
Unrealized gain (loss) on marketable securities, | (180) |  |  | (180) |
Translation adjustment | (191) |  |  | (191) |
Net income (loss) | 39,152 |  |  |  | 39,152
Ending Balance (in shares) at Dec. 31, 2015 |  | 28,653 |  |  |
Ending 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 | 5,087 | $ 1 | 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

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