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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 1,324,846 | $ (1,116) | $ 481 | $ 731,435 | $ (46) | $ 771,925 | $ (1,116) | $ (178,949)
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 48,148 |  |  |  |  | (9,872)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 27,348 |  |  |  |  | 27,348 |  |
Exercise of stock options and vesting of restricted stock units | $ 6,528 |  |  | (14,405) |  |  |  | $ 20,933
Exercise of stock options and vesting of restricted stock units (in shares) | 94 |  |  |  |  |  |  | 111
Employee taxes paid for withheld shares upon equity award settlement | $ (1,337) |  |  |  |  |  |  | $ (1,337)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  |  |  | (7)
Stock compensation | 14,416 |  |  | 14,416 |  |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 2,349 |  |  | (373) |  |  |  | $ 2,722
Issuance of shares pursuant to employee stock purchase plan (in shares) | 15 |  |  |  |  |  |  | 15
Treasury stock purchases | $ (14,289) |  |  |  |  |  |  | $ (14,289)
Treasury stock purchases (in shares) | (72) |  |  |  |  |  |  | (72)
Balance at Mar. 31, 2019 | $ 1,358,745 |  | $ 481 | 731,073 | (46) | 798,157 |  | $ (170,920)
Ending balance (in shares) at Mar. 31, 2019 |  |  | 48,148 |  |  |  |  | (9,825)
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 | 47,550 |  |  |  |  |  |  |
Exercise of stock options and vesting of restricted stock units | $ 46,236 |  |  | 38,942 |  |  |  | $ 7,294
Exercise of stock options and vesting of restricted stock units (in shares) | 481 |  |  |  |  |  |  | 498
Employee taxes paid for withheld shares upon equity award settlement | $ (2,301) |  |  |  |  |  |  | $ (2,301)
Employee taxes paid for withheld shares upon equity award settlement (in shares) |  |  |  |  |  |  |  | (7)
Stock compensation | 17,302 |  |  | 17,302 |  |  |  |
Issuance of shares pursuant to employee stock purchase plan | $ 2,469 |  |  | 2,367 |  |  |  | $ 102
Issuance of shares pursuant to employee stock purchase plan (in shares) | 10 |  |  |  |  |  |  | 10
Treasury stock purchases | $ (15,482) |  |  |  |  |  |  | $ (15,482)
Treasury stock purchases (in shares) | (59) |  |  |  |  |  |  | (59)
Balance at Mar. 31, 2020 | $ 1,712,832 |  | $ 481 | $ 798,089 | $ (46) | $ 964,886 |  | $ (50,578)
Ending balance (in shares) at Mar. 31, 2020 |  |  | 48,148 |  |  |  |  | (8,397)

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