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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Previously Reported | Revision of Prior Period, Accounting Standards Update, Adjustment | Common Stock | Common Stock Previously Reported | Treasury Stock | Treasury Stock Previously Reported | Additional Paid-in Capital | Additional Paid-in Capital Previously Reported | (Accumulated Deficit) Retained Earnings | (Accumulated Deficit) Retained Earnings Previously Reported | (Accumulated Deficit) Retained Earnings Revision of Prior Period, Accounting Standards Update, Adjustment | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Previously Reported
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 598,856 | $ 589,703 | $ 9,153 | $ 356 | $ 356 | $ (6,030) | $ (6,030) | $ 639,381 | $ 639,381 | $ (32,334) | $ (41,487) | $ 9,153 | $ (2,517) | $ (2,517)
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |
Net income | 19,198 |  |  |  |  |  |  |  |  | 19,198 |  |  |  |
Foreign currency translation | (274) |  |  |  |  |  |  |  |  |  |  |  | (274) |
Stock-based compensation expense | 3,183 |  |  |  |  |  |  | 3,183 |  |  |  |  |  |
Stock options exercised | 934 |  |  | 1 |  |  |  | 933 |  |  |  |  |  |
Balance at Mar. 31, 2019 | 621,897 |  |  | 357 |  | (6,030) |  | 643,497 |  | (13,136) |  |  | (2,791) |
Balance at Dec. 31, 2018 | 598,856 | $ 589,703 | $ 9,153 | 356 | $ 356 | (6,030) | $ (6,030) | 639,381 | $ 639,381 | (32,334) | $ (41,487) | $ 9,153 | (2,517) | $ (2,517)
Net income | 46,653 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 140 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 | 658,055 |  |  | 359 |  | (6,030) |  | 651,784 |  | 14,319 |  |  | (2,377) |
Balance at Mar. 31, 2019 | 621,897 |  |  | 357 |  | (6,030) |  | 643,497 |  | (13,136) |  |  | (2,791) |
Net income | 27,455 |  |  |  |  |  |  |  |  | 27,455 |  |  |  |
Foreign currency translation | 414 |  |  |  |  |  |  |  |  |  |  |  | 414 |
Stock-based compensation expense | 5,385 |  |  |  |  |  |  | 5,385 |  |  |  |  |  |
Stock options exercised | 2,904 |  |  | 2 |  |  |  | 2,902 |  |  |  |  |  |
Balance at Jun. 30, 2019 | 658,055 |  |  | 359 |  | (6,030) |  | 651,784 |  | 14,319 |  |  | (2,377) |
Balance at Dec. 31, 2019 | 726,283 |  |  | 360 |  | (6,030) |  | 666,585 |  | 68,109 |  |  | (2,741) |
Net income | 28,954 |  |  |  |  |  |  |  |  | 28,954 |  |  |  |
Foreign currency translation | (988) |  |  |  |  |  |  |  |  |  |  |  | (988) |
Stock-based compensation expense | 5,445 |  |  |  |  |  |  | 5,445 |  |  |  |  |  |
Stock options exercised | 1,343 |  |  | 1 |  |  |  | 1,342 |  |  |  |  |  |
Repurchases of common stock | (43,238) |  |  | (6) |  |  |  |  |  | (43,232) |  |  |  |
Balance at Mar. 31, 2020 | 717,799 |  |  | 355 |  | (6,030) |  | 673,372 |  | 53,831 |  |  | (3,729) |
Balance at Dec. 31, 2019 | 726,283 |  |  | 360 |  | (6,030) |  | 666,585 |  | 68,109 |  |  | (2,741) |
Net income | 53,058 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (482) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2020 | 738,069 |  |  | 354 |  | (6,030) |  | 676,621 |  | 70,347 |  |  | (3,223) |
Balance at Mar. 31, 2020 | 717,799 |  |  | 355 |  | (6,030) |  | 673,372 |  | 53,831 |  |  | (3,729) |
Net income | 24,104 |  |  |  |  |  |  |  |  | 24,104 |  |  |  |
Foreign currency translation | 506 |  |  |  |  |  |  |  |  |  |  |  | 506 |
Stock-based compensation expense | 2,616 |  |  |  |  |  |  | 2,616 |  |  |  |  |  |
Stock options exercised | 633 |  |  |  |  |  |  | 633 |  |  |  |  |  |
Repurchases of common stock | (7,589) |  |  | (1) |  |  |  |  |  | (7,588) |  |  |  |
Balance at Jun. 30, 2020 | $ 738,069 |  |  | $ 354 |  | $ (6,030) |  | $ 676,621 |  | $ 70,347 |  |  | $ (3,223) |

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