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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, 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 stock on restricted stock units, net of shares withheld (in shares) | 67 |  |  |  |
Issuance of common stock 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 |  |  |  |  | 126,087
Foreign currency translation adjustments |  |  |  |  | (7,561)
Change in pension obligation |  |  |  |  | 25
Balance (in shares) at Sep. 30, 2022 | 32,937 |  |  |  |
Balance at Sep. 30, 2022 | $ 33 | 549,735 | 70,893 | (5,771) | 614,890
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 stock under Employee Stock Purchase Plan (in shares) | 15 |  |  |  |
Issuance of stock under Employee Stock Purchase Plan |  | 711 |  |  | 711
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 205 |  |  |  |
Issuance of common stock 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
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 40,283 |  | 40,283
Foreign currency translation adjustments |  |  |  | (3,690) | (3,690)
Change in pension obligation |  |  |  | 8 | 8
Exercise of stock options (in shares) | 30 |  |  |  |
Exercise of stock options |  | 367 |  |  | 367
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 8 |  |  |  |
Issuance of common stock on restricted stock units, net of shares withheld |  | (70) |  |  | (70)
Stock-based compensation expense |  | 3,562 |  |  | 3,562
Repurchase of common stock (in shares) | (195) |  |  |  |
Repurchase of common stock |  | (3,525) | (8,972) |  | (12,497)
Balance (in shares) at Sep. 30, 2022 | 32,937 |  |  |  |
Balance at Sep. 30, 2022 | $ 33 | 549,735 | 70,893 | (5,771) | 614,890
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 |  |  | 47,697 |  | 47,697
Foreign currency translation adjustments |  |  |  | 50 | 50
Exercise of stock options (in shares) | 2 |  |  |  |
Exercise of stock options |  | 25 |  |  | 25
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 56 |  |  |  |
Issuance of common stock on restricted stock units, net of shares withheld |  | (3,907) |  |  | (3,907)
Stock-based compensation expense |  | 3,199 |  |  | 3,199
Repurchase of common stock (in shares) | (107) |  |  |  |
Repurchase of common stock |  | (1,924) | (10,575) |  | (12,499)
Balance (in shares) at Mar. 31, 2023 | 32,726 |  |  |  |
Balance at Mar. 31, 2023 | $ 33 | 547,692 | 156,014 | (1,918) | 701,821
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 |  |  |  |  | 175,207
Foreign currency translation adjustments |  |  |  |  | (2,192)
Balance (in shares) at Sep. 30, 2023 | 32,772 |  |  |  |
Balance at Sep. 30, 2023 | $ 33 | 543,577 | 261,521 | (4,160) | 800,971
Balance (in shares) at Mar. 31, 2023 | 32,726 |  |  |  |
Balance at Mar. 31, 2023 | $ 33 | 547,692 | 156,014 | (1,918) | 701,821
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 61,579 |  | 61,579
Foreign currency translation adjustments |  |  |  | (1,011) | (1,011)
Issuance of stock under Employee Stock Purchase Plan (in shares) | 6 |  |  |  |
Issuance of stock under Employee Stock Purchase Plan |  | 957 |  |  | 957
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 199 |  |  |  |
Issuance of common stock on restricted stock units, net of shares withheld |  | (11,558) |  |  | (11,558)
Stock-based compensation expense |  | 4,749 |  |  | 4,749
Repurchase of common stock (in shares) | (95) |  |  |  |
Repurchase of common stock |  | (1,720) | (10,780) |  | (12,500)
Balance (in shares) at Jun. 30, 2023 | 32,836 |  |  |  |
Balance at Jun. 30, 2023 | $ 33 | 540,120 | 206,813 | (2,929) | 744,037
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 65,931 |  | 65,931
Foreign currency translation adjustments |  |  |  | (1,231) | (1,231)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 7 |  |  |  |
Issuance of common stock on restricted stock units, net of shares withheld |  | (349) |  |  | (349)
Stock-based compensation expense |  | 5,082 |  |  | 5,082
Repurchase of common stock (in shares) | (71) |  |  |  |
Repurchase of common stock |  | (1,276) | (11,223) |  | (12,499)
Balance (in shares) at Sep. 30, 2023 | 32,772 |  |  |  |
Balance at Sep. 30, 2023 | $ 33 | $ 543,577 | $ 261,521 | $ (4,160) | $ 800,971

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