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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 |  |  | 16,480 |  | 16,480
Foreign currency translation adjustments |  |  |  | (1,372) | (1,372)
Change in pension obligation |  |  |  | 20 | 20
Exercise of stock options (in shares) | 268 |  |  |  |
Exercise of stock options |  | 2,512 |  |  | 2,512
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 81 |  |  |  |
Issuance of common shares on restricted stock units, net of shares withheld |  | (2,354) |  |  | (2,354)
Stock-based compensation expense |  | 2,407 |  |  | 2,407
Repurchase of common stock (in shares) | (303) |  |  |  |
Repurchase of common stock |  | (5,468) | (6,167) |  | (11,635)
Balance (in shares) at Mar. 31, 2021 | 33,679 |  |  |  |
Balance at Mar. 31, 2021 | $ 34 | 567,199 | (81,656) | 2,083 | 487,660
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 |  |  |  |  | 35,386
Foreign currency translation adjustments |  |  |  |  | (820)
Change in pension obligation |  |  |  |  | 54
Balance (in shares) at Jun. 30, 2021 | 33,657 |  |  |  |
Balance at Jun. 30, 2021 | $ 34 | 561,680 | (70,281) | 2,669 | 494,102
Balance (in shares) at Mar. 31, 2021 | 33,679 |  |  |  |
Balance at Mar. 31, 2021 | $ 34 | 567,199 | (81,656) | 2,083 | 487,660
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 18,906 |  | 18,906
Foreign currency translation adjustments |  |  |  | 552 | 552
Change in pension obligation |  |  |  | 34 | 34
Exercise of stock options (in shares) | 72 |  |  |  |
Exercise of stock options |  | 563 |  |  | 563
Issuance of shares under Employee Stock Purchase Plan (in shares) | 15 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 509 |  |  | 509
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 214 |  |  |  |
Issuance of common shares on restricted stock units, net of shares withheld |  | (4,141) |  |  | (4,141)
Stock-based compensation expense |  | 3,377 |  |  | 3,377
Repurchase of common stock (in shares) | (323) |  |  |  |
Repurchase of common stock |  | (5,827) | (7,531) |  | (13,358)
Balance (in shares) at Jun. 30, 2021 | 33,657 |  |  |  |
Balance at Jun. 30, 2021 | $ 34 | 561,680 | (70,281) | 2,669 | 494,102
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 |  |  | 41,614 |  | 41,614
Foreign currency translation adjustments |  |  |  | (1,186) | (1,186)
Change in pension obligation |  |  |  | 9 | 9
Exercise of stock options (in shares) | 41 |  |  |  |
Exercise of stock options |  | 491 |  |  | 491
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 67 |  |  |  |
Issuance of common shares on restricted stock units, net of shares withheld |  | (3,315) |  |  | (3,315)
Stock-based compensation expense |  | 2,701 |  |  | 2,701
Repurchase of common stock (in shares) | (284) |  |  |  |
Repurchase of common stock |  | (5,127) | (14,873) |  | (20,000)
Balance (in shares) at Mar. 31, 2022 | 33,064 |  |  |  |
Balance at Mar. 31, 2022 | $ 33 | 554,633 | 4,019 | 588 | 559,273
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 |  |  |  |  | 85,804
Foreign currency translation adjustments |  |  |  |  | (3,871)
Change in pension obligation |  |  |  |  | 17
Balance (in shares) at Jun. 30, 2022 | 33,094 |  |  |  |
Balance at Jun. 30, 2022 | $ 33 | 549,401 | 39,582 | (2,089) | 586,927
Balance (in shares) at Mar. 31, 2022 | 33,064 |  |  |  |
Balance at Mar. 31, 2022 | $ 33 | 554,633 | 4,019 | 588 | 559,273
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 44,189 |  | 44,189
Foreign currency translation adjustments |  |  |  | (2,685) | (2,685)
Change in pension obligation |  |  |  | 8 | 8
Exercise of stock options (in shares) | 25 |  |  |  |
Exercise of stock options |  | 298 |  |  | 298
Issuance of shares under Employee Stock Purchase Plan (in shares) | 15 |  |  |  |
Issuance of shares under Employee Stock Purchase Plan |  | 711 |  |  | 711
Issuance of common shares on restricted stock units, net of shares withheld (in shares) | 205 |  |  |  |
Issuance of common shares on restricted stock units, net of shares withheld |  | (5,896) |  |  | (5,896)
Stock-based compensation expense |  | 3,527 |  |  | 3,527
Repurchase of common stock (in shares) | (215) |  |  |  |
Repurchase of common stock |  | (3,872) | (8,626) |  | (12,498)
Balance (in shares) at Jun. 30, 2022 | 33,094 |  |  |  |
Balance at Jun. 30, 2022 | $ 33 | $ 549,401 | $ 39,582 | $ (2,089) | $ 586,927

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