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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - UNAUDITED - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Common Stock Warrants | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Earnings
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2018 | $ 361,024 | $ 693 | $ 9,082 | $ 441,417 | $ (842,360) | $ (42,935) | $ 795,127
Balance, beginning of period, shares at Dec. 31, 2018 |  | 33,158 |  |  |  |  |
Net income |  |  |  |  |  |  | 19,251
Unrealized gain on short-term investments, net of tax |  |  |  |  |  | 18 |
Foreign currency translation adjustments |  |  |  |  |  | 3,847 |
Total comprehensive income, net of tax | 23,116 |  |  |  |  |  |
Repurchase of common stock | (13,424) |  |  | (4,134) | (9,290) |  |
Repurchase of common stock, shares |  | (352) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 512 |  |  | 512 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 15 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 4 |  | (4) |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 462 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (3) |  |  |  |  |
Stock-based compensation expense | 3,693 |  |  | 3,693 |  |  |
Dividends | (7,411) |  |  |  |  |  | (7,411)
Balance, ending of period at Mar. 31, 2019 | 367,510 | $ 697 | 9,082 | 441,484 | (851,650) | (39,070) | 806,967
Balance, ending of period, shares at Mar. 31, 2019 |  | 33,280 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | 361,024 | $ 693 | 9,082 | 441,417 | (842,360) | (42,935) | 795,127
Balance, beginning of period, shares at Dec. 31, 2018 |  | 33,158 |  |  |  |  |
Net income | 38,630 |  |  |  |  |  |
Unrealized gain on short-term investments, net of tax | 28 |  |  |  |  |  |
Foreign currency translation adjustments | 29 |  |  |  |  |  |
Total comprehensive income, net of tax | 38,687 |  |  |  |  |  |
Balance, ending of period at Jun. 30, 2019 | 374,324 | $ 696 | 9,082 | 446,512 | (858,186) | (42,878) | 819,098
Balance, ending of period, shares at Jun. 30, 2019 |  | 33,062 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2019 | 367,510 | $ 697 | 9,082 | 441,484 | (851,650) | (39,070) | 806,967
Balance, beginning of period, shares at Mar. 31, 2019 |  | 33,280 |  |  |  |  |
Net income | 19,379 |  |  |  |  |  | 19,379
Unrealized gain on short-term investments, net of tax | 10 |  |  |  |  | 10 |
Foreign currency translation adjustments | (3,818) |  |  |  |  | (3,818) |
Total comprehensive income, net of tax | 15,571 |  |  |  |  |  |
Repurchase of common stock | (6,919) |  |  | (383) | (6,536) |  |
Repurchase of common stock, shares |  | (148) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 603 |  |  | 603 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 15 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 6 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans |  | $ (1) |  | 1 |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (91) |  |  |  |  |
Stock-based compensation expense | 4,807 |  |  | 4,807 |  |  |
Dividends | (7,248) |  |  |  |  |  | (7,248)
Balance, ending of period at Jun. 30, 2019 | 374,324 | $ 696 | $ 9,082 | 446,512 | (858,186) | (42,878) | 819,098
Balance, ending of period, shares at Jun. 30, 2019 |  | 33,062 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2019 | $ 396,662 | $ 696 |  | 454,663 | (867,817) | (39,503) | 848,623
Balance, beginning of period, shares at Dec. 31, 2019 | 32,891 | 32,891 |  |  |  |  |
Net income |  |  |  |  |  |  | 21,514
Unrealized gain on short-term investments, net of tax |  |  |  |  |  | (24) |
Foreign currency translation adjustments |  |  |  |  |  | (15,084) |
Total comprehensive income, net of tax | $ 6,406 |  |  |  |  |  |
Repurchase of common stock | (13,965) | $ (2) |  | (7,555) | (6,408) |  |
Repurchase of common stock, shares |  | (299) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 564 |  |  | 564 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 14 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 5 |  | (5) |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 476 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (7) |  |  |  |  |
Stock-based compensation expense | 4,857 |  |  | 4,857 |  |  |
Dividends | (7,693) |  |  |  |  |  | (7,693)
Balance, ending of period at Mar. 31, 2020 | 386,831 | $ 699 |  | 452,524 | (874,225) | (54,611) | 862,444
Balance, ending of period, shares at Mar. 31, 2020 |  | 33,075 |  |  |  |  |
Balance, beginning of period at Dec. 31, 2019 | $ 396,662 | $ 696 |  | 454,663 | (867,817) | (39,503) | 848,623
Balance, beginning of period, shares at Dec. 31, 2019 | 32,891 | 32,891 |  |  |  |  |
Net income | $ 31,880 |  |  |  |  |  |
Unrealized gain on short-term investments, net of tax | 28 |  |  |  |  |  |
Foreign currency translation adjustments | (12,413) |  |  |  |  |  |
Total comprehensive income, net of tax | 19,495 |  |  |  |  |  |
Balance, ending of period at Jun. 30, 2020 | $ 397,622 | $ 699 |  | 458,362 | (874,592) | (51,888) | 865,041
Balance, ending of period, shares at Jun. 30, 2020 | 33,080 | 33,080 |  |  |  |  |
Balance, beginning of period at Mar. 31, 2020 | $ 386,831 | $ 699 |  | 452,524 | (874,225) | (54,611) | 862,444
Balance, beginning of period, shares at Mar. 31, 2020 |  | 33,075 |  |  |  |  |
Net income | 10,366 |  |  |  |  |  | 10,366
Unrealized gain on short-term investments, net of tax | 52 |  |  |  |  | 52 |
Foreign currency translation adjustments | 2,671 |  |  |  |  | 2,671 |
Total comprehensive income, net of tax | 13,089 |  |  |  |  |  |
Repurchase of common stock | (467) |  |  | (100) | (367) |  |
Repurchase of common stock, shares |  | (11) |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 683 |  |  | 683 |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 18 |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 12 |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (14) |  |  |  |  |
Stock-based compensation expense | 5,255 |  |  | 5,255 |  |  |
Dividends | (7,769) |  |  |  |  |  | (7,769)
Balance, ending of period at Jun. 30, 2020 | $ 397,622 | $ 699 |  | $ 458,362 | $ (874,592) | $ (51,888) | $ 865,041
Balance, ending of period, shares at Jun. 30, 2020 | 33,080 | 33,080 |  |  |  |  |

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