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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 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 | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 | 82,770 |  |  |  |  |  | 82,770 |
Unrealized gain on short-term investments, net of tax | 14 |  |  |  |  | 14 |  |
Foreign currency translation adjustments | 3,418 |  |  |  |  | 3,418 |  |
Total comprehensive income, net of tax | 86,202 |  |  |  |  |  |  |
Repurchase of common stock | (30,525) |  |  | (5,068) | (25,457) |  |  |
Repurchase of common stock, shares |  | (693) |  |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 2,227 |  |  | 2,227 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 55 |  |  |  |  |  |
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 |  | 513 |  |  |  |  |  |
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 |  | (142) |  |  |  |  |  |
Stock-based compensation expense | 19,919 |  |  | 19,919 |  |  |  |
Exercise of Comcast stock warrants | (12,911) |  | $ (9,082) | (3,829) |  |  |  |
Dividends | (29,274) |  |  |  |  |  | (29,274) |
Balance, ending of period at Dec. 31, 2019 | 396,662 | $ 696 |  | 454,663 | (867,817) | (39,503) | 848,623 |
Balance, ending of period, shares at Dec. 31, 2019 |  | 32,891 |  |  |  |  |  |
Net income | 58,711 |  |  |  |  |  | 58,711 |
Unrealized gain on short-term investments, net of tax | (3) |  |  |  |  | (3) |  |
Foreign currency translation adjustments | 8,368 |  |  |  |  | 8,368 |  |
Total comprehensive income, net of tax | 67,076 |  |  |  |  |  |  |
Repurchase of common stock | (38,168) |  |  | (11,859) | (26,309) |  |  |
Repurchase of common stock, shares |  | (878) |  |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 2,523 |  |  | 2,523 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 68 |  |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 7 |  | (7) |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 672 |  |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans | (3) | $ (3) |  |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (40) |  |  |  |  |  |
Stock-based compensation expense | 25,237 |  |  | 25,237 |  |  |  |
Dividends | (30,932) |  |  |  |  |  | (30,932) |
Balance, ending of period at Dec. 31, 2020 | $ 422,395 | $ 700 |  | 470,557 | (894,126) | (31,138) | 876,402 |
Balance, ending of period, shares at Dec. 31, 2020 | 32,713 | 32,713 |  |  |  |  |  |
Net income | $ 72,331 |  |  |  |  |  | 72,331 |
Unrealized gain on short-term investments, net of tax | (19) |  |  |  |  | (19) |  |
Foreign currency translation adjustments | (7,196) |  |  |  |  | (7,196) |  |
Total comprehensive income, net of tax | 65,116 |  |  |  |  |  |  |
Repurchase of common stock | (42,238) |  |  | (6,258) | (35,980) |  |  |
Repurchase of common stock, shares |  | (863) |  |  |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 2,610 |  |  | 2,610 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan, shares |  | 64 |  |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans |  | $ 6 |  |  |  |  |  |
Issuance of restricted common stock pursuant to stock-based compensation plans, shares |  | 661 |  |  |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans | (1) | $ (1) |  | (6) |  |  |  |
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares |  | (80) |  |  |  |  |  |
Stock-based compensation expense | 21,400 |  |  | 21,400 |  |  |  |
Dividends | (32,673) |  |  |  |  |  | (32,673) |
Noncontrolling interest related to business combination | 3,635 |  |  |  |  |  |  | $ 3,635
Balance, ending of period at Dec. 31, 2021 | $ 440,244 | $ 705 |  | $ 488,303 | $ (930,106) | $ (38,353) | $ 916,060 | $ 3,635
Balance, ending of period, shares at Dec. 31, 2021 | 32,495 | 32,495 |  |  |  |  |  |

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