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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 | 59,564 |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 29 | $ 198,384 | $ (2,139) | $ 351,408 | $ 547,682
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) | 1,182 |  |  |  |
Issuance of common stock under employee stock option and stock award plans |  | 4,010 |  |  | 4,010
Repurchase of common stock (in shares) | (3,144) |  |  |  |
Repurchase of common stock | $ (1) | (103,153) |  |  | (103,154)
Issuance of common stock under employee stock purchase plan (in shares) | 176 |  |  |  |
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 on marketable securities |  |  | 161 |  | 161
Translation adjustment |  |  | (236) |  | (236)
Net income (loss) |  |  |  | 69,984 | 69,984
Ending Balance (in shares) at Dec. 31, 2018 | 57,778 |  |  |  |
Ending Balance at Dec. 31, 2018 | $ 28 | 126,164 | (1,689) | 402,569 | 527,072
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) | 1,130 |  |  |  |
Issuance of common stock under employee stock option and stock award plans |  | 4,359 |  |  | 4,359
Repurchase of common stock (in shares) | (242) |  |  |  |
Repurchase of common stock |  | (7,302) |  |  | (7,302)
Issuance of common stock under employee stock purchase plan (in shares) | 196 |  |  |  |
Issuance of common stock under employee stock purchase plan |  | 5,549 |  |  | 5,549
Stock-based compensation expense related to employee stock options and awards |  | 21,686 |  |  | 21,686
Stock-based compensation expense related to employee stock purchases |  | 1,661 |  |  | 1,661
Payment of dividends to stockholders |  |  |  | (20,506) | (20,506)
Unrealized actuarial gain (loss) on pension benefits |  |  | (1,772) |  | (1,772)
Unrealized gain on marketable securities |  |  | 849 |  | 849
Translation adjustment |  |  | (518) |  | (518)
Net income (loss) |  |  |  | 193,468 | 193,468
Ending Balance (in shares) at Dec. 31, 2019 | 58,862 |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 28 | 152,117 | (3,130) | 575,531 | 724,546
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) | 963 |  |  |  |
Issuance of common stock under employee stock option and stock award plans |  | 4,608 |  |  | 4,608
Repurchase of common stock (in shares) | (63) |  |  |  |
Repurchase of common stock |  | (2,636) |  |  | (2,636)
Issuance of common stock under employee stock purchase plan (in shares) | 148 |  |  |  |
Issuance of common stock under employee stock purchase plan |  | 5,919 |  |  | 5,919
Stock-based compensation expense related to employee stock options and awards |  | 28,952 |  |  | 28,952
Stock-based compensation expense related to employee stock purchases |  | 1,960 |  |  | 1,960
Payment of dividends to stockholders |  |  |  | (25,081) | (25,081)
Unrealized actuarial gain (loss) on pension benefits |  |  | 843 |  | 843
Unrealized gain on marketable securities |  |  | 307 |  | 307
Translation adjustment |  |  | (183) |  | (183)
Net income (loss) |  |  |  | 71,176 | 71,176
Ending Balance (in shares) at Dec. 31, 2020 | 59,910 |  |  |  |
Ending Balance at Dec. 31, 2020 | $ 28 | $ 190,920 | $ (2,163) | $ 621,626 | $ 810,411

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