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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ 1,617,058 | $ 481 | $ 739,478 | $ (46) | $ 917,336 | $ (40,191)
Beginning balance (in shares) at Dec. 31, 2019 |  | 48,148 |  |  |  | 8,839
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 101,442 |  |  |  | 101,442 |
Exercise of stock options and vesting of restricted stock units | $ 92,337 |  | 66,584 |  |  | $ 25,753
Exercise of stock options and vesting of restricted stock units (in shares) | 917 |  |  |  |  | 980
Employee taxes paid for withheld shares upon equity award settlement | $ (6,892) |  |  |  |  | $ (6,892)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (19)
Stock compensation | 35,688 |  | 35,688 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 5,177 |  | 2,248 |  |  | $ 2,929
Issuance of shares pursuant to employee stock purchase plan (in shares) | 20 |  |  |  |  | 20
Treasury stock purchases | $ (15,482) |  |  |  |  | $ (15,482)
Treasury stock purchases (in shares) | (59) |  |  |  |  | (59)
Balance at Jun. 30, 2020 | $ 1,829,328 | $ 481 | 843,998 | (46) | 1,018,778 | $ (33,883)
Ending balance (in shares) at Jun. 30, 2020 |  | 48,148 |  |  |  | 7,917
Balance at Mar. 31, 2020 | 1,712,832 | $ 481 | 798,089 | (46) | 964,886 | $ (50,578)
Beginning balance (in shares) at Mar. 31, 2020 |  | 48,148 |  |  |  | 8,397
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 53,892 |  |  |  | 53,892 |
Exercise of stock options and vesting of restricted stock units | $ 46,101 |  | 27,642 |  |  | $ 18,459
Exercise of stock options and vesting of restricted stock units (in shares) | 436 |  |  |  |  | 482
Employee taxes paid for withheld shares upon equity award settlement | $ (4,591) |  |  |  |  | $ (4,591)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (12)
Stock compensation | 18,386 |  | 18,386 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 2,708 |  | (119) |  |  | $ 2,827
Issuance of shares pursuant to employee stock purchase plan (in shares) | 10 |  |  |  |  | 10
Treasury stock purchases | $ 0 |  |  |  |  |
Treasury stock purchases (in shares) | 0 |  |  |  |  |
Balance at Jun. 30, 2020 | $ 1,829,328 | $ 481 | 843,998 | (46) | 1,018,778 | $ (33,883)
Ending balance (in shares) at Jun. 30, 2020 |  | 48,148 |  |  |  | 7,917
Balance at Dec. 31, 2020 | 1,986,111 | $ 481 | 905,332 | (46) | 1,112,156 | $ (31,812)
Beginning balance (in shares) at Dec. 31, 2020 |  | 48,148 |  |  |  | 7,609
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 62,506 |  |  |  | 62,506 |
Exercise of stock options and vesting of restricted stock units | $ 29,388 |  | (1,623) |  |  | $ 31,011
Exercise of stock options and vesting of restricted stock units (in shares) | 210 |  |  |  |  | 346
Employee taxes paid for withheld shares upon equity award settlement | $ (16,010) |  |  |  |  | $ (16,010)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (37)
Stock compensation | 50,899 |  | 50,899 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 6,200 |  | 6,077 |  |  | $ 123
Issuance of shares pursuant to employee stock purchase plan (in shares) | 17 |  |  |  |  | 17
Treasury stock purchases | $ (12,975) |  |  |  |  | $ (12,975)
Treasury stock purchases (in shares) | (32) |  |  |  |  | (32)
Purchase consideration for conversion of unvested restricted stock | $ 1,872 |  | 1,872 |  |  |
Balance at Jun. 30, 2021 | 2,107,991 | $ 481 | 962,557 | (46) | 1,174,662 | $ (29,663)
Ending balance (in shares) at Jun. 30, 2021 |  | 48,148 |  |  |  | 7,315
Balance at Mar. 31, 2021 | 2,060,993 | $ 481 | 941,960 | (46) | 1,149,132 | $ (30,534)
Beginning balance (in shares) at Mar. 31, 2021 |  | 48,148 |  |  |  | 7,424
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 25,530 |  |  |  | 25,530 |
Exercise of stock options and vesting of restricted stock units | $ 11,286 |  | (9,544) |  |  | $ 20,830
Exercise of stock options and vesting of restricted stock units (in shares) | 89 |  |  |  |  | 150
Employee taxes paid for withheld shares upon equity award settlement | $ (7,052) |  |  |  |  | $ (7,052)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (18)
Stock compensation | 25,175 |  | 25,175 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 3,162 |  | 3,094 |  |  | $ 68
Issuance of shares pursuant to employee stock purchase plan (in shares) | 9 |  |  |  |  | 9
Treasury stock purchases | $ (12,975) |  |  |  |  | $ (12,975)
Treasury stock purchases (in shares) | (32) |  |  |  |  | (32)
Purchase consideration for conversion of unvested restricted stock | $ 1,872 |  | 1,872 |  |  |
Balance at Jun. 30, 2021 | $ 2,107,991 | $ 481 | $ 962,557 | $ (46) | $ 1,174,662 | $ (29,663)
Ending balance (in shares) at Jun. 30, 2021 |  | 48,148 |  |  |  | 7,315

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