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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2022 | $ 33 | $ 550,299 | $ 118,892 | $ (1,968) | $ 667,256
Balance (in shares) at Dec. 31, 2022 | 32,775 |  |  |  |
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 |  | (3,907) |  |  | (3,907)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 56 |  |  |  |
Stock-based compensation expense |  | 3,199 |  |  | 3,199
Repurchase of common stock |  | (1,924) | (10,575) |  | (12,499)
Repurchase of common stock (in shares) | (107) |  |  |  |
Balance at Mar. 31, 2023 | $ 33 | 547,692 | 156,014 | (1,918) | 701,821
Balance (in shares) at Mar. 31, 2023 | 32,726 |  |  |  |
Balance at Dec. 31, 2022 | $ 33 | 550,299 | 118,892 | (1,968) | 667,256
Balance (in shares) at Dec. 31, 2022 | 32,775 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  |  |  | 175,207
Foreign currency translation adjustments |  |  |  |  | (2,192)
Balance at Sep. 30, 2023 | $ 33 | 543,577 | 261,521 | (4,160) | 800,971
Balance (in shares) at Sep. 30, 2023 | 32,772 |  |  |  |
Balance at Mar. 31, 2023 | $ 33 | 547,692 | 156,014 | (1,918) | 701,821
Balance (in shares) at Mar. 31, 2023 | 32,726 |  |  |  |
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 |  | 957 |  |  | 957
Issuance of stock under Employee Stock Purchase Plan (in shares) | 6 |  |  |  |
Issuance of common stock on restricted stock units, net of shares withheld |  | (11,558) |  |  | (11,558)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 199 |  |  |  |
Stock-based compensation expense |  | 4,749 |  |  | 4,749
Repurchase of common stock |  | (1,720) | (10,780) |  | (12,500)
Repurchase of common stock (in shares) | (95) |  |  |  |
Balance at Jun. 30, 2023 | $ 33 | 540,120 | 206,813 | (2,929) | 744,037
Balance (in shares) at Jun. 30, 2023 | 32,836 |  |  |  |
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 |  | (349) |  |  | (349)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 7 |  |  |  |
Stock-based compensation expense |  | 5,082 |  |  | 5,082
Repurchase of common stock |  | (1,276) | (11,223) |  | (12,499)
Repurchase of common stock (in shares) | (71) |  |  |  |
Balance at Sep. 30, 2023 | $ 33 | 543,577 | 261,521 | (4,160) | 800,971
Balance (in shares) at Sep. 30, 2023 | 32,772 |  |  |  |
Balance at Dec. 31, 2023 | $ 33 | 547,189 | 319,506 | (1,846) | 864,882
Balance (in shares) at Dec. 31, 2023 | 32,685 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 51,595 |  | 51,595
Foreign currency translation adjustments |  |  |  | (1,731) | (1,731)
Change in pension obligation |  |  |  | 5 | 5
Issuance of common stock on restricted stock units, net of shares withheld |  | (2,699) |  |  | (2,699)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 42 |  |  |  |
Stock-based compensation expense |  | 4,690 |  |  | 4,690
Repurchase of common stock |  | (2,201) | (12,798) |  | (14,999)
Repurchase of common stock (in shares) | (122) |  |  |  |
Balance at Mar. 31, 2024 | $ 33 | 546,979 | 358,303 | (3,572) | 901,743
Balance (in shares) at Mar. 31, 2024 | 32,605 |  |  |  |
Balance at Dec. 31, 2023 | $ 33 | 547,189 | 319,506 | (1,846) | 864,882
Balance (in shares) at Dec. 31, 2023 | 32,685 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  |  |  | 151,036
Foreign currency translation adjustments |  |  |  |  | (387)
Change in pension obligation |  |  |  |  | 15
Balance at Sep. 30, 2024 | $ 33 | 545,350 | 432,429 | (2,218) | 975,594
Balance (in shares) at Sep. 30, 2024 | 32,504 |  |  |  |
Balance at Mar. 31, 2024 | $ 33 | 546,979 | 358,303 | (3,572) | 901,743
Balance (in shares) at Mar. 31, 2024 | 32,605 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 50,866 |  | 50,866
Foreign currency translation adjustments |  |  |  | (913) | (913)
Change in pension obligation |  |  |  | 5 | 5
Issuance of stock under Employee Stock Purchase Plan |  | 1,242 |  |  | 1,242
Issuance of stock under Employee Stock Purchase Plan (in shares) | 10 |  |  |  |
Issuance of common stock on restricted stock units, net of shares withheld |  | (8,468) |  |  | (8,468)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 143 |  |  |  |
Stock-based compensation expense |  | 5,469 |  |  | 5,469
Repurchase of common stock |  | (2,545) | (12,451) |  | (14,996)
Repurchase of common stock (in shares) | (141) |  |  |  |
Balance at Jun. 30, 2024 | $ 33 | 542,677 | 396,718 | (4,480) | 934,948
Balance (in shares) at Jun. 30, 2024 | 32,617 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income |  |  | 48,576 |  | 48,576
Foreign currency translation adjustments |  |  |  | 2,257 | 2,257
Change in pension obligation |  |  |  | 5 | 5
Issuance of common stock on restricted stock units, net of shares withheld |  | (241) |  |  | (241)
Issuance of common stock on restricted stock units, net of shares withheld (in shares) | 5 |  |  |  |
Stock-based compensation expense |  | 5,412 |  |  | 5,412
Repurchase of common stock |  | (2,498) | (12,865) |  | (15,363)
Repurchase of common stock (in shares) | (118) |  |  |  |
Balance at Sep. 30, 2024 | $ 33 | $ 545,350 | $ 432,429 | $ (2,218) | $ 975,594
Balance (in shares) at Sep. 30, 2024 | 32,504 |  |  |  |

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