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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2021 | $ 2,324,032 | $ 481 | $ 1,075,650 | $ (46) | $ 1,273,614 | $ (25,667)
Balance (in shares) at Dec. 31, 2021 |  | 48,148,000 |  |  |  |
Balance (in shares) at Dec. 31, 2021 |  |  |  |  |  | (6,833,000)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 79,930 |  |  |  | 79,930 |
Other comprehensive loss, net of tax | (763) |  |  | (763) |  |
Exercise of stock options and vesting of restricted stock units | 16,223 |  | (5,897) |  |  | $ 22,120
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 279,000
Employee taxes paid for withheld shares upon equity award settlement | (20,330) |  |  |  |  | $ (20,330)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (50,000)
Stock compensation | 51,079 |  | 51,079 |  |  |
Issuance of shares pursuant to employee stock purchase plan | 8,156 |  | 7,989 |  |  | $ 167
Issuance of shares pursuant to employee stock purchase plan (in shares) |  |  |  |  |  | 20,000
Balance at Jun. 30, 2022 | 2,458,327 | $ 481 | 1,128,821 | (809) | 1,353,544 | $ (23,710)
Balance (in shares) at Jun. 30, 2022 |  | 48,148,000 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  |  |  |  | (6,584,000)
Balance at Mar. 31, 2022 | 2,387,734 | $ 481 | 1,098,933 | (743) | 1,313,598 | $ (24,535)
Balance (in shares) at Mar. 31, 2022 |  | 48,148,000 |  |  |  |
Balance (in shares) at Mar. 31, 2022 |  |  |  |  |  | (6,697,000)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 39,946 |  |  |  | 39,946 |
Other comprehensive loss, net of tax | (66) |  |  | (66) |  |
Exercise of stock options and vesting of restricted stock units | 8,178 |  | (288) |  |  | $ 8,466
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 122,000
Employee taxes paid for withheld shares upon equity award settlement | (7,743) |  |  |  |  | $ (7,743)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (21,000)
Stock compensation | 25,800 |  | 25,800 |  |  |
Issuance of shares pursuant to employee stock purchase plan | 4,478 |  | 4,376 |  |  | $ 102
Issuance of shares pursuant to employee stock purchase plan (in shares) |  |  |  |  |  | 12,000
Balance at Jun. 30, 2022 | 2,458,327 | $ 481 | 1,128,821 | (809) | 1,353,544 | $ (23,710)
Balance (in shares) at Jun. 30, 2022 |  | 48,148,000 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  |  |  |  | (6,584,000)
Balance at Dec. 31, 2022 | $ 2,624,389 | $ 481 | 1,209,725 | (844) | 1,437,854 | $ (22,827)
Balance (in shares) at Dec. 31, 2022 | 48,147,969 | 48,148,000 |  |  |  |
Balance (in shares) at Dec. 31, 2022 | (6,364,991) |  |  |  |  | (6,365,000)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | $ 80,005 |  |  |  | 80,005 |
Other comprehensive loss, net of tax | 59 |  |  | 59 |  |
Exercise of stock options and vesting of restricted stock units | 20,867 |  | 1,023 |  |  | $ 19,844
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 309,000
Employee taxes paid for withheld shares upon equity award settlement | (18,744) |  |  |  |  | $ (18,744)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (52,000)
Stock compensation | 53,924 |  | 53,924 |  |  |
Issuance of shares pursuant to employee stock purchase plan | 7,751 |  | 7,643 |  |  | $ 108
Issuance of shares pursuant to employee stock purchase plan (in shares) |  |  |  |  |  | 27,000
Balance at Jun. 30, 2023 | $ 2,768,251 | $ 481 | 1,272,315 | (785) | 1,517,859 | $ (21,619)
Balance (in shares) at Jun. 30, 2023 | 48,147,969 | 48,148,000 |  |  |  |
Balance (in shares) at Jun. 30, 2023 | (6,081,263) |  |  |  |  | (6,081,000)
Balance at Mar. 31, 2023 | $ 2,686,133 | $ 481 | 1,239,945 | (750) | 1,468,729 | $ (22,272)
Balance (in shares) at Mar. 31, 2023 |  | 48,148,000 |  |  |  |
Balance (in shares) at Mar. 31, 2023 |  |  |  |  |  | (6,244,000)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 49,130 |  |  |  | 49,130 |
Other comprehensive loss, net of tax | (35) |  |  | (35) |  |
Exercise of stock options and vesting of restricted stock units | 12,734 |  | 1,692 |  |  | $ 11,042
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 173,000
Employee taxes paid for withheld shares upon equity award settlement | (10,452) |  |  |  |  | $ (10,452)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (26,000)
Stock compensation | 26,028 |  | 26,028 |  |  |
Issuance of shares pursuant to employee stock purchase plan | 4,713 |  | 4,650 |  |  | $ 63
Issuance of shares pursuant to employee stock purchase plan (in shares) |  |  |  |  |  | 16,000
Balance at Jun. 30, 2023 | $ 2,768,251 | $ 481 | $ 1,272,315 | $ (785) | $ 1,517,859 | $ (21,619)
Balance (in shares) at Jun. 30, 2023 | 48,147,969 | 48,148,000 |  |  |  |
Balance (in shares) at Jun. 30, 2023 | (6,081,263) |  |  |  |  | (6,081,000)

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