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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - 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 |  |  |  |
Net loss | (425,703) |  |  | (425,703) |  |
Foreign currency translation adjustment | 2,991 |  |  |  | (2,991) |
Issuance of restricted stock | 0 | $ 2 | (2) |  |  |
Issuance of restricted stock (in shares) |  | 185 |  |  |  |
Vesting of restricted stock units | 0 | $ 12 | (12) |  |  |
Vesting of restricted stock units (in shares) |  | 1,173 |  |  |  |
Forfeitures of restricted stock | 0 |  |  |  |  |
Forfeitures of restricted stock (in shares) |  | 2 |  |  |  |
Exercise of stock options | 9,219 | $ 7 | 9,212 |  |  |
Exercised |  | 700 |  |  |  |
Stock-based compensation | 39,328 |  | 39,328 |  |  |
Payment of cash dividends | (32,428) |  |  | (32,428) |  |
Dividend equivalents | (524) |  |  | (524) |  |
Purchase of treasury stock | (264,686) |  |  |  |  | (264,686)
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 |  |  |  |
Net loss | (803,692) |  |  | (803,692) |  |
Foreign currency translation adjustment | (66) |  |  |  | (66) |
Issuance of restricted stock |  | $ 3 | (3) |  |  |
Issuance of restricted stock (in shares) |  | 333 |  |  |  |
Vesting of restricted stock units |  | $ 13 | (13) |  |  |
Vesting of restricted stock units (in shares) |  | 1,324 |  |  |  |
Stock-based compensation | 26,572 |  | 26,572 |  |  |
Payment of cash dividends | (18,862) |  |  | (18,862) |  |
Dividend equivalents | (334) |  |  | (334) |  |
Purchase of treasury stock | (21,179) |  |  |  |  | (21,179)
Ending Balance at Dec. 31, 2020 | $ 2,016,059 | $ 2,710 | 2,902,236 | 472,014 | 5,412 | (1,366,313)
Ending Balance (in shares) at Dec. 31, 2020 | 271,028,688 | 271,029 |  |  |  |
Net loss | $ (654,545) |  |  | (654,545) |  |
Foreign currency translation adjustment | 503 |  |  |  | 503 |
Restricted stock issued for acquisition | 248,025 | $ 263 | 247,762 |  |  |
Restricted stock issued for acquisition (in shares) |  | 26,274 |  |  |  |
Issuance of restricted stock |  | $ 6 | (6) |  |  |
Issuance of restricted stock (in shares) |  | 621 |  |  |  |
Vesting of restricted stock units | $ 0 | $ 14 | (14) |  |  |
Vesting of restricted stock units (in shares) |  | 1,345 |  |  |  |
Exercised | 0 |  |  |  |  |
Stock-based compensation | $ 21,558 |  | 21,558 |  |  |
Payment of cash dividends | (15,605) |  |  | (15,605) |  |
Dividend equivalents | (180) |  |  | (180) |  |
Purchase of treasury stock | (6,328) |  |  |  |  | (6,328)
Ending Balance at Dec. 31, 2021 | $ 1,609,487 | $ 2,993 | $ 3,171,536 | $ (198,316) | $ 5,915 | $ (1,372,641)
Ending Balance (in shares) at Dec. 31, 2021 | 299,268,967 | 299,269 |  |  |  |

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