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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2020 | 33,633 |  |  |  |
Balance at Dec. 31, 2020 | $ 34 | $ 570,102 | $ (91,969) | $ 3,435 | $ 481,602
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 98,650 |  | 98,650
Foreign currency translation adjustments |  |  |  | (1,881) | (1,881)
Change in pension obligation, net of tax |  |  |  | 211 | 211
Exercise of stock options (in shares) | 396 |  |  |  |
Exercise of stock options |  | 3,687 |  |  | 3,687
Issuance of stock under Employee Stock Purchase Plan (in shares) | 26 |  |  |  |
Issuance of stock under Employee Stock Purchase Plan |  | 1,179 |  |  | 1,179
Issuance of restricted common shares (in shares) | 326 |  |  |  |
Issuance of restricted common shares |  | (6,564) |  |  | (6,564)
Stock-based compensation expense |  | 12,067 |  |  | 12,067
Repurchase of common stock (in shares) | (1,141) |  |  |  |
Repurchase of common stock | $ (1) | (20,588) | (29,403) |  | (49,992)
Balance (in shares) at Dec. 31, 2021 | 33,240 |  |  |  |
Balance at Dec. 31, 2021 | $ 33 | 559,883 | (22,722) | 1,765 | 538,959
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 183,079 |  | 183,079
Foreign currency translation adjustments |  |  |  | (4,058) | (4,058)
Change in pension obligation, net of tax |  |  |  | 325 | 325
Exercise of stock options (in shares) | 103 |  |  |  |
Exercise of stock options |  | 1,247 |  |  | 1,247
Issuance of stock under Employee Stock Purchase Plan (in shares) | 29 |  |  |  |
Issuance of stock under Employee Stock Purchase Plan |  | 1,662 |  |  | 1,662
Issuance of restricted common shares (in shares) | 291 |  |  |  |
Issuance of restricted common shares |  | (9,907) |  |  | (9,907)
Stock-based compensation expense |  | 13,444 |  |  | 13,444
Repurchase of common stock (in shares) | (888) |  |  |  |
Repurchase of common stock |  | (16,030) | (41,465) |  | (57,495)
Balance (in shares) at Dec. 31, 2022 | 32,775 |  |  |  |
Balance at Dec. 31, 2022 | $ 33 | 550,299 | 118,892 | (1,968) | 667,256
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 246,263 |  | 246,263
Foreign currency translation adjustments |  |  |  | 38 | 38
Change in pension obligation, net of tax |  |  |  | 84 | 84
Exercise of stock options (in shares) | 3 |  |  |  |
Exercise of stock options |  | 25 |  |  | 25
Issuance of stock under Employee Stock Purchase Plan (in shares) | 16 |  |  |  |
Issuance of stock under Employee Stock Purchase Plan |  | 2,057 |  |  | 2,057
Issuance of restricted common shares (in shares) | 271 |  |  |  |
Issuance of restricted common shares |  | (16,611) |  |  | (16,611)
Stock-based compensation expense |  | 18,269 |  |  | 18,269
Repurchase of common stock (in shares) | (380) |  |  |  |
Repurchase of common stock |  | (6,850) | (45,649) |  | (52,499)
Balance (in shares) at Dec. 31, 2023 | 32,685 |  |  |  |
Balance at Dec. 31, 2023 | $ 33 | $ 547,189 | $ 319,506 | $ (1,846) | $ 864,882

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