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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, shares at Dec. 31, 2017 |  | 48,148 |  |  |  | 10,262
Balance at Dec. 31, 2017 | $ 1,191,736 | $ 481 | $ 626,867 | $ (46) | $ 624,463 | $ (60,029)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 115,910 |  |  |  |  |
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 1,048
Exercise of stock options and vesting of restricted stock units | 70,536 |  | 54,666 |  |  | $ 15,870
Stock compensation | $ 37,966 |  | 37,966 |  |  |
Issuance of shares pursuant to employee stock purchase plan (in shares) | 35 |  |  |  |  | 35
Issuance of shares pursuant to employee stock purchase plan | $ 5,978 |  | 5,436 |  |  | $ 542
Treasury stock purchases (in shares) | 0 |  |  |  |  |
Treasury stock purchases | $ 0 |  |  |  |  |
Balance, shares at Sep. 30, 2018 |  | 48,148 |  |  |  | 9,179
Balance at Sep. 30, 2018 | 1,422,126 | $ 481 | 724,935 | (46) | 740,373 | $ (43,617)
Balance, shares at Jun. 30, 2018 |  | 48,148 |  |  |  | 9,517
Balance at Jun. 30, 2018 | 1,340,289 | $ 481 | 686,782 | (46) | 701,449 | $ (48,377)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 38,924 |  |  |  | 38,924 |
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 326
Exercise of stock options and vesting of restricted stock units | 26,219 |  | 21,645 |  |  | $ 4,574
Stock compensation | $ 14,476 |  | 14,476 |  |  |
Issuance of shares pursuant to employee stock purchase plan (in shares) | 12 |  |  |  |  | 12
Issuance of shares pursuant to employee stock purchase plan | $ 2,218 |  | 2,032 |  |  | $ 186
Treasury stock purchases (in shares) | 0 |  |  |  |  |
Treasury stock purchases | $ 0 |  |  |  |  |
Balance, shares at Sep. 30, 2018 |  | 48,148 |  |  |  | 9,179
Balance at Sep. 30, 2018 | 1,422,126 | $ 481 | 724,935 | (46) | 740,373 | $ (43,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Retained earnings adjustment-adoption of Topic 842 Leases, net of taxes | (1,116) |  |  |  | (1,116) |
Balance, shares at Dec. 31, 2018 |  | 48,148 |  |  |  | 9,872
Balance at Dec. 31, 2018 | 1,324,846 | $ 481 | 731,435 | (46) | 771,925 | $ (178,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 99,737 |  |  |  | 99,737 |
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 746
Exercise of stock options and vesting of restricted stock units | 62,295 |  | (82,449) |  |  | $ 144,744
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (17)
Employee taxes paid for withheld shares upon equity award settlement | (3,572) |  |  |  |  | $ (3,572)
Stock compensation | $ 44,369 |  | 44,369 |  |  |
Issuance of shares pursuant to employee stock purchase plan (in shares) | 43 |  |  |  |  | 43
Issuance of shares pursuant to employee stock purchase plan | $ 7,327 |  | (769) |  |  | $ 8,096
Treasury stock purchases (in shares) | (72) |  |  |  |  | (72)
Treasury stock purchases | $ (14,289) |  |  |  |  | $ (14,289)
Balance, shares at Sep. 30, 2019 |  | 48,148 |  |  |  | 9,172
Balance at Sep. 30, 2019 | 1,519,597 | $ 481 | 692,586 | (46) | 870,546 | $ (43,970)
Balance, shares at Jun. 30, 2019 |  | 48,148 |  |  |  | 9,582
Balance at Jun. 30, 2019 | 1,421,630 | $ 481 | 715,920 | (46) | 830,156 | $ (124,881)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 40,390 |  |  |  |  |
Exercise of stock options and vesting of restricted stock units (in shares) |  |  |  |  |  | 396
Exercise of stock options and vesting of restricted stock units | 40,163 |  | (38,160) |  |  | $ 78,323
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  | (1)
Employee taxes paid for withheld shares upon equity award settlement | (191) |  |  |  |  | $ (191)
Stock compensation | $ 14,887 |  | 14,887 |  |  |
Issuance of shares pursuant to employee stock purchase plan (in shares) | 15 |  |  |  |  | 15
Issuance of shares pursuant to employee stock purchase plan | $ 2,718 |  | (61) |  |  | $ 2,779
Treasury stock purchases (in shares) | 0 |  |  |  |  |
Treasury stock purchases | $ 0 |  |  |  |  |
Balance, shares at Sep. 30, 2019 |  | 48,148 |  |  |  | 9,172
Balance at Sep. 30, 2019 | $ 1,519,597 | $ 481 | $ 692,586 | $ (46) | $ 870,546 | $ (43,970)

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