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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings (Accumulated Deficit) [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2020 | $ 555,907 | $ 873 | $ (246,088) | $ 658,423 | $ 364 | $ 142,335
BALANCE, shares at Dec. 31, 2020 |  | 87,265,000 |  |  |  |
BALANCE, shares at Dec. 31, 2020 |  |  | (17,203,000) |  |  |
Net income | 85,171 |  |  |  |  | 85,171
Foreign currency translation | (175) |  |  |  | (175) |
Unrealized gain (loss) on investments, net of tax | (192) |  |  |  | (192) |
Treasury stock purchased | (5,372) |  | $ (5,372) |  |  |
Treasury stock purchased, shares |  |  | (440,000) |  |  |
Share-based compensation expense | 11,287 |  |  | 11,287 |  |
Common stock issued | (1,241) | $ 6 | $ (2,034) | 787 |  |
Common stock issued, shares |  | 643,000 | (160,000) |  |  |
BALANCE at Sep. 30, 2021 | 645,385 | $ 879 | $ (253,494) | 670,497 | (3) | 227,506
BALANCE, shares at Sep. 30, 2021 |  | 87,908,000 |  |  |  |
BALANCE, shares at Sep. 30, 2021 |  |  | (17,803,000) |  |  |
BALANCE at Jun. 30, 2021 | 613,612 | $ 879 | $ (253,494) | 666,470 | 20 | 199,737
BALANCE, shares at Jun. 30, 2021 |  | 87,885,000 |  |  |  |
BALANCE, shares at Jun. 30, 2021 |  |  | (17,803,000) |  |  |
Net income | 27,769 |  |  |  |  | 27,769
Foreign currency translation | (74) |  |  |  | (74) |
Unrealized gain (loss) on investments, net of tax | 51 |  |  |  | 51 |
Share-based compensation expense | 3,857 |  |  | 3,857 |  |
Common stock issued | 170 |  |  | 170 |  |
Common stock issued, shares |  | 23,000 |  |  |  |
BALANCE at Sep. 30, 2021 | 645,385 | $ 879 | $ (253,494) | 670,497 | (3) | 227,506
BALANCE, shares at Sep. 30, 2021 |  | 87,908,000 |  |  |  |
BALANCE, shares at Sep. 30, 2021 |  |  | (17,803,000) |  |  |
BALANCE at Dec. 31, 2021 | $ 650,110 | $ 887 | $ (276,895) | 674,242 | (96) | 251,972
BALANCE, shares at Dec. 31, 2021 | 88,724,438 | 88,724,000 |  |  |  |
BALANCE, shares at Dec. 31, 2021 | (19,975,776) |  | (19,976,000) |  |  |
Net income | $ 79,912 |  |  |  |  | 79,912
Foreign currency translation | (383) |  |  |  | (383) |
Unrealized gain (loss) on investments, net of tax | (5,838) |  |  |  | (5,838) |
Treasury stock purchased | (23,117) |  | $ (23,117) |  |  |
Treasury stock purchased, shares |  |  | (2,099,000) |  |  |
Share-based compensation expense | 6,234 |  |  | 6,234 |  |
Common stock issued | (696) | $ 7 | $ (1,612) | 909 |  |
Common stock issued, shares |  | 641,000 | (146,000) |  |  |
BALANCE at Sep. 30, 2022 | $ 706,222 | $ 894 | $ (301,624) | 681,385 | (6,317) | 331,884
BALANCE, shares at Sep. 30, 2022 | 89,365,126 | 89,365,000 |  |  |  |
BALANCE, shares at Sep. 30, 2022 | (22,220,707) |  | (22,221,000) |  |  |
BALANCE at Jun. 30, 2022 | $ 692,760 | $ 894 | $ (294,177) | 679,400 | (3,174) | 309,817
BALANCE, shares at Jun. 30, 2022 |  | 89,359,000 |  |  |  |
BALANCE, shares at Jun. 30, 2022 |  |  | (21,602,000) |  |  |
Net income | 22,067 |  |  |  |  | 22,067
Foreign currency translation | (138) |  |  |  | (138) |
Unrealized gain (loss) on investments, net of tax | (3,005) |  |  |  | (3,005) |
Treasury stock purchased | (7,447) |  | $ (7,447) |  |  |
Treasury stock purchased, shares |  |  | (619,000) |  |  |
Share-based compensation expense | 1,918 |  |  | 1,918 |  |
Common stock issued | 67 |  |  | 67 |  |
Common stock issued, shares |  | 6,000 |  |  |  |
BALANCE at Sep. 30, 2022 | $ 706,222 | $ 894 | $ (301,624) | $ 681,385 | $ (6,317) | $ 331,884
BALANCE, shares at Sep. 30, 2022 | 89,365,126 | 89,365,000 |  |  |  |
BALANCE, shares at Sep. 30, 2022 | (22,220,707) |  | (22,221,000) |  |  |

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