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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss), Net | Retained Earnings
--- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2018 |  | 79,778 |  |  |
Beginning Balance at Dec. 31, 2018 | $ 1,252,891 | $ 8 | $ 877,514 | $ (2,774) | $ 378,143
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 71,848 |  |  |  | 71,848
Net change in unrealized gains (losses) from investments | 84 |  |  | 84 |
Net change in foreign currency translation adjustment | 409 |  |  | 409 |
Issuance of common stock relating to employee equity compensation plans (in shares) |  | 427 |  |  |
Issuance of common stock relating to employee equity compensation plans | 9,609 |  | 9,609 |  |
Tax withholdings related to net share settlements of equity awards | (50,181) |  | (50,181) |  |
Common stock repurchased and retired (shares) |  | (205) |  |  |
Stock Repurchased and Retired During Period, Value | (50,000) |  | (2,030) |  | (47,970)
Stock-based compensation | 21,044 |  | 21,044 |  |
Ending Balance (in shares) at Mar. 31, 2019 |  | 80,000 |  |  |
Ending Balance at Mar. 31, 2019 | 1,255,704 | $ 8 | 855,956 | (2,281) | 402,021
Beginning Balance (in shares) at Dec. 31, 2018 |  | 79,778 |  |  |
Beginning Balance at Dec. 31, 2018 | 1,252,891 | $ 8 | 877,514 | (2,774) | 378,143
Ending Balance (in shares) at Dec. 31, 2019 |  | 78,433 |  |  |
Ending Balance at Dec. 31, 2019 | 1,346,169 | $ 8 | 906,937 | (688) | 439,912
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 1,518,131 |  |  |  | 1,518,131
Net change in unrealized gains (losses) from investments | (194) |  |  | (194) |
Net change in foreign currency translation adjustment | 689 |  |  | 689 |
Issuance of common stock relating to employee equity compensation plans (in shares) |  | 326 |  |  |
Issuance of common stock relating to employee equity compensation plans | 10,662 |  | 10,662 |  |
Tax withholdings related to net share settlements of equity awards | (45,395) |  | (45,395) |  |
Stock-based compensation | 22,927 |  | 22,927 |  |
Ending Balance (in shares) at Mar. 31, 2020 |  | 78,759 |  |  |
Ending Balance at Mar. 31, 2020 | $ 2,852,989 | $ 8 | $ 895,131 | $ (193) | $ 1,958,043

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