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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 3,505,423 | $ 2,673 | $ 2,827,154 | $ 1,753,557 | $ 2,487 | $ (1,080,448)
Beginning Balance (in shares) at Dec. 31, 2018 |  | 267,316,000 |  |  |  |
Net loss | (28,614) |  |  | (28,614) |  |
Foreign currency translation adjustment | 944 |  |  |  | 944 |
Vesting of restricted stock units (in shares) |  | 38,000 |  |  |  |
Forfeitures of restricted stock (in shares) |  | (1,000) |  |  |  |
Stock-based compensation | 9,338 |  | 9,338 |  |  |
Payment of cash dividends | (8,499) |  |  | (8,499) |  |
Dividend equivalents | (110) |  |  | (110) |  |
Purchase of treasury stock | (75,113) |  |  |  |  | (75,113)
Ending Balance at Mar. 31, 2019 | 3,403,369 | $ 2,673 | 2,836,492 | 1,716,334 | 3,431 | (1,155,561)
Ending Balance (in shares) at Mar. 31, 2019 |  | 267,353,000 |  |  |  |
Beginning Balance at Dec. 31, 2018 | 3,505,423 | $ 2,673 | 2,827,154 | 1,753,557 | 2,487 | (1,080,448)
Beginning Balance (in shares) at Dec. 31, 2018 |  | 267,316,000 |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 2,833,620 | $ 2,694 | 2,875,680 | 1,294,902 | 5,478 | (1,345,134)
Ending Balance (in shares) at Dec. 31, 2019 | 269,372,257 | 269,372,000 |  |  |  |
Net loss | $ (434,722) |  |  | (434,722) |  |
Foreign currency translation adjustment | (1,386) |  |  |  | (1,386) |
Vesting of restricted stock units |  | $ 1 | (1) |  |  |
Vesting of restricted stock units (in shares) |  | 151,000 |  |  |  |
Stock-based compensation | 9,160 |  | 9,160 |  |  |
Payment of cash dividends | (7,629) |  |  | (7,629) |  |
Dividend equivalents | (125) |  |  | (125) |  |
Purchase of treasury stock | (20,025) |  |  |  |  | (20,025)
Ending Balance at Mar. 31, 2020 | $ 2,378,893 | $ 2,695 | $ 2,884,839 | $ 852,426 | $ 4,092 | $ (1,365,159)
Ending Balance (in shares) at Mar. 31, 2020 | 269,523,313 | 269,523,000 |  |  |  |

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