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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, 2016 | $ 934,541 | $ 481 | $ 556,663 | $ (46) | $ 454,892 | $ (77,449)
Balance, shares at Dec. 31, 2016 |  | 48,148 |  |  |  | 11,382
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 169,571 |  |  |  | 169,571 |
Issuance of shares pursuant to stock compensation plan | $ 49,845 |  | 28,174 |  |  | $ 21,671
Issuance of shares pursuant to stock compensation plan, shares | 1,113 |  |  |  |  | 1,113
Stock compensation | $ 37,348 |  | 37,348 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 7,044 |  | 4,682 |  |  | $ 2,362
Issuance of shares pursuant to employee stock purchase plan, shares | 51 |  |  |  |  | 51
Treasury stock purchases | $ (6,613) |  |  |  |  | $ (6,613)
Treasury stock purchases, shares | (44) |  |  |  |  | (44)
Balance at Dec. 31, 2017 | $ 1,191,736 | $ 481 | 626,867 | (46) | 624,463 | $ (60,029)
Balance, shares at Dec. 31, 2017 |  | 48,148 |  |  |  | 10,262
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 147,462 |  |  |  | 147,462 |
Issuance of shares pursuant to stock compensation plan | $ 74,907 |  | 44,458 |  |  | $ 30,449
Issuance of shares pursuant to stock compensation plan, shares | 1,126 |  |  |  |  | 1,126
Stock compensation | $ 52,740 |  | 52,740 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 8,051 |  | 7,370 |  |  | $ 681
Issuance of shares pursuant to employee stock purchase plan, shares | 45 |  |  |  |  | 45
Treasury stock purchases | $ (150,050) |  |  |  |  | $ (150,050)
Treasury stock purchases, shares | (781) |  |  |  |  | (781)
Balance at Dec. 31, 2018 | $ 1,324,846 | $ 481 | 731,435 | (46) | 771,925 | $ (178,949)
Balance, shares at Dec. 31, 2018 |  | 48,148 |  |  |  | 9,872
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 146,527 |  |  |  | 146,527 |
Issuance of shares pursuant to stock compensation plan | $ 96,908 |  | (52,833) |  |  | $ 149,741
Issuance of shares pursuant to stock compensation plan, shares | 999 |  |  |  |  | 1,075
Employee taxes paid for withheld shares for taxes upon equity award | $ (5,361) |  |  |  |  | $ (5,361)
Employee taxes paid for withheld shares for taxes upon equity award, shares |  |  |  |  |  | (23)
Stock compensation | 59,967 |  | 59,967 |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 9,576 |  | 909 |  |  | $ 8,667
Issuance of shares pursuant to employee stock purchase plan, shares | 53 |  |  |  |  | 53
Treasury stock purchases | $ (14,289) |  |  |  |  | $ (14,289)
Treasury stock purchases, shares | (72) |  |  |  |  | (72)
Balance at Dec. 31, 2019 | $ 1,617,058 | $ 481 | $ 739,478 | $ (46) | $ 917,336 | $ (40,191)
Balance, shares at Dec. 31, 2019 |  | 48,148 |  |  |  | 8,839

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