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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2020 | $ 606,224 | $ 357,803 | $ (5,452) | $ 958,575
Beginning balance (in shares) at Dec. 31, 2020 | 55,623 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 10,958 |  | 10,958
Other comprehensive income (loss) |  |  | (1,730) | (1,730)
Stock-based compensation expense | $ 3,310 |  |  | 3,310
Options exercised | $ 5,897 |  |  | 5,897
Options exercised (in shares) | 291 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 263 |  |  | 263
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Shares issued from time-vested restricted stock units (in shares) | 25 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (488) |  |  | (488)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (9) |  |  |
Shares surrendered in exchange for exercise of stock options | $ (93) |  |  | (93)
Shares surrendered in exchange for exercise of stock options (in shares) | (2) |  |  |
Ending balance at Mar. 31, 2021 | $ 615,113 | 368,761 | (7,182) | 976,692
Ending balance (in shares) at Mar. 31, 2021 | 55,933 |  |  |
Beginning balance at Dec. 31, 2020 | $ 606,224 | 357,803 | (5,452) | 958,575
Beginning balance (in shares) at Dec. 31, 2020 | 55,623 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  |  | 27,841
Other comprehensive income (loss) |  |  |  | (764)
Shares surrendered in exchange for exercise of stock options |  |  |  | (179)
Ending balance at Sep. 30, 2021 | $ 633,948 | 385,644 | (6,216) | 1,013,376
Ending balance (in shares) at Sep. 30, 2021 | 56,452 |  |  |
Beginning balance at Mar. 31, 2021 | $ 615,113 | 368,761 | (7,182) | 976,692
Beginning balance (in shares) at Mar. 31, 2021 | 55,933 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 4,916 |  | 4,916
Other comprehensive income (loss) |  |  | 2,348 | 2,348
Stock-based compensation expense | $ 2,765 |  |  | 2,765
Options exercised | $ 5,455 |  |  | 5,455
Options exercised (in shares) | 253 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 258 |  |  | 258
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 4 |  |  |
Shares issued from time-vested restricted stock units (in shares) | 34 |  |  |
Ending balance at Jun. 30, 2021 | $ 623,591 | 373,677 | (4,834) | 992,434
Ending balance (in shares) at Jun. 30, 2021 | 56,224 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 11,967 |  | 11,967
Other comprehensive income (loss) |  |  | (1,382) | (1,382)
Stock-based compensation expense | $ 4,411 |  |  | 4,411
Options exercised | $ 5,806 |  |  | 5,806
Options exercised (in shares) | 225 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 314 |  |  | 314
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (88) |  |  | (88)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (1) |  |  |
Shares surrendered in exchange for exercise of stock options | $ (86) |  |  | (86)
Shares surrendered in exchange for exercise of stock options (in shares) | (1) |  |  |
Ending balance at Sep. 30, 2021 | $ 633,948 | 385,644 | (6,216) | 1,013,376
Ending balance (in shares) at Sep. 30, 2021 | 56,452 |  |  |
Beginning balance at Dec. 31, 2021 | $ 641,533 | 406,257 | (7,991) | $ 1,039,799
Beginning balance (in shares) at Dec. 31, 2021 | 56,570 |  |  | 56,570
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 10,545 |  | $ 10,545
Other comprehensive income (loss) |  |  | 1,338 | 1,338
Stock-based compensation expense | $ 4,212 |  |  | 4,212
Options exercised | $ 1,320 |  |  | 1,320
Options exercised (in shares) | 52 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 320 |  |  | 320
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Shares issued from time-vested restricted stock units (in shares) | 44 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (1,015) |  |  | (1,015)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (16) |  |  |
Ending balance at Mar. 31, 2022 | $ 646,370 | 416,802 | (6,653) | 1,056,519
Ending balance (in shares) at Mar. 31, 2022 | 56,655 |  |  |
Beginning balance at Dec. 31, 2021 | $ 641,533 | 406,257 | (7,991) | $ 1,039,799
Beginning balance (in shares) at Dec. 31, 2021 | 56,570 |  |  | 56,570
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  |  | $ 41,115
Other comprehensive income (loss) |  |  |  | (8,738)
Shares surrendered in exchange for exercise of stock options |  |  |  | (898)
Ending balance at Sep. 30, 2022 | $ 658,198 | 447,372 | (16,729) | $ 1,088,841
Ending balance (in shares) at Sep. 30, 2022 | 56,918 |  |  | 56,918
Beginning balance at Mar. 31, 2022 | $ 646,370 | 416,802 | (6,653) | $ 1,056,519
Beginning balance (in shares) at Mar. 31, 2022 | 56,655 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 15,298 |  | 15,298
Other comprehensive income (loss) |  |  | (4,066) | (4,066)
Stock-based compensation expense | $ 3,952 |  |  | 3,952
Options exercised | $ 1,303 |  |  | 1,303
Options exercised (in shares) | 58 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 301 |  |  | 301
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 6 |  |  |
Shares issued from time-vested restricted stock units (in shares) | 26 |  |  |
Ending balance at Jun. 30, 2022 | $ 651,926 | 432,100 | (10,719) | 1,073,307
Ending balance (in shares) at Jun. 30, 2022 | 56,745 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 15,272 |  | 15,272
Other comprehensive income (loss) |  |  | (6,010) | (6,010)
Stock-based compensation expense | $ 3,893 |  |  | 3,893
Options exercised | $ 4,141 |  |  | 4,141
Options exercised (in shares) | 201 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 246 |  |  | 246
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (1,110) |  |  | (1,110)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (18) |  |  |
Shares surrendered in exchange for exercise of stock options | $ (898) |  |  | (898)
Shares surrendered in exchange for exercise of stock options (in shares) | (15) |  |  |
Ending balance at Sep. 30, 2022 | $ 658,198 | $ 447,372 | $ (16,729) | $ 1,088,841
Ending balance (in shares) at Sep. 30, 2022 | 56,918 |  |  | 56,918

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