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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, 2019 | $ 2,833,620 | $ 2,694 | $ 2,875,680 | $ 1,294,902 | $ 5,478 | $ (1,345,134)
Beginning Balance (in shares) at Dec. 31, 2019 |  | 269,372 |  |  |  |
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 |  |  |  |
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 |  |  |  |
Beginning Balance at Dec. 31, 2019 | 2,833,620 | $ 2,694 | 2,875,680 | 1,294,902 | 5,478 | (1,345,134)
Beginning Balance (in shares) at Dec. 31, 2019 |  | 269,372 |  |  |  |
Net loss | (697,165) |  |  |  |  |
Foreign currency translation adjustment | (473) |  |  |  |  |
Ending Balance at Sep. 30, 2020 | 2,119,563 | $ 2,708 | 2,895,753 | 582,360 | 5,005 | (1,366,263)
Ending Balance (in shares) at Sep. 30, 2020 |  | 270,861 |  |  |  |
Beginning Balance at Mar. 31, 2020 | 2,378,893 | $ 2,695 | 2,884,839 | 852,426 | 4,092 | (1,365,159)
Beginning Balance (in shares) at Mar. 31, 2020 |  | 269,523 |  |  |  |
Net loss | (150,332) |  |  | (150,332) |  |
Foreign currency translation adjustment | 695 |  |  |  | 695 |
Vesting of restricted stock units |  | $ 11 | (11) |  |  |
Vesting of restricted stock units (in shares) |  | 1,046 |  |  |  |
Stock-based compensation | 4,335 |  | 4,335 |  |  |
Payment of cash dividends | (3,735) |  |  | (3,735) |  |
Dividend equivalents | (73) |  |  | (73) |  |
Purchase of treasury stock | (910) |  |  |  |  | (910)
Ending Balance at Jun. 30, 2020 | 2,228,873 | $ 2,706 | 2,889,163 | 698,286 | 4,787 | (1,366,069)
Ending Balance (in shares) at Jun. 30, 2020 |  | 270,569 |  |  |  |
Net loss | (112,111) |  |  | (112,111) |  |
Foreign currency translation adjustment | 218 |  |  |  | 218 |
Vesting of restricted stock units |  | $ 2 | (2) |  |  |
Vesting of restricted stock units (in shares) |  | 292 |  |  |  |
Stock-based compensation | 6,592 |  | 6,592 |  |  |
Payment of cash dividends | (3,746) |  |  | (3,746) |  |
Dividend equivalents | (69) |  |  | (69) |  |
Purchase of treasury stock | (194) |  |  |  |  | (194)
Ending Balance at Sep. 30, 2020 | 2,119,563 | $ 2,708 | 2,895,753 | 582,360 | 5,005 | (1,366,263)
Ending Balance (in shares) at Sep. 30, 2020 |  | 270,861 |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ 2,016,059 | $ 2,710 | 2,902,236 | 472,014 | 5,412 | (1,366,313)
Beginning Balance (in shares) at Dec. 31, 2020 | 271,028,688 | 271,029,000 |  |  |  |
Net loss | $ (106,413) |  |  | (106,413) |  |
Foreign currency translation adjustment | 418 |  |  |  | 418 |
Vesting of restricted stock units |  | $ 2 | (2) |  |  |
Vesting of restricted stock units (in shares) |  | 163,000 |  |  |  |
Stock-based compensation | 5,891 |  | 5,891 |  |  |
Payment of cash dividends | (3,754) |  |  | (3,754) |  |
Dividend equivalents | (55) |  |  | (55) |  |
Ending Balance at Mar. 31, 2021 | 1,912,146 | $ 2,712 | 2,908,125 | 361,792 | 5,830 | (1,366,313)
Ending Balance (in shares) at Mar. 31, 2021 |  | 271,192 |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ 2,016,059 | $ 2,710 | 2,902,236 | 472,014 | 5,412 | (1,366,313)
Beginning Balance (in shares) at Dec. 31, 2020 | 271,028,688 | 271,029,000 |  |  |  |
Net loss | $ (292,720) |  |  |  |  |
Foreign currency translation adjustment | 441 |  |  |  |  |
Ending Balance at Sep. 30, 2021 | $ 1,725,645 | $ 2,729 | 2,919,090 | 167,860 | 5,853 | (1,369,887)
Ending Balance (in shares) at Sep. 30, 2021 | 272,885,704 | 272,886 |  |  |  |
Beginning Balance at Mar. 31, 2021 | $ 1,912,146 | $ 2,712 | 2,908,125 | 361,792 | 5,830 | (1,366,313)
Beginning Balance (in shares) at Mar. 31, 2021 |  | 271,192 |  |  |  |
Net loss | (103,309) |  |  | (103,309) |  |
Foreign currency translation adjustment | 255 |  |  |  | 255 |
Vesting of restricted stock units |  | $ 16 | (16) |  |  |
Vesting of restricted stock units (in shares) |  | 1,643 |  |  |  |
Stock-based compensation | 5,934 |  | 5,934 |  |  |
Payment of cash dividends | (3,769) |  |  | (3,769) |  |
Dividend equivalents | (18) |  |  | (18) |  |
Purchase of treasury stock | (3,522) |  |  |  |  | (3,522)
Ending Balance at Jun. 30, 2021 | 1,807,717 | $ 2,728 | 2,914,043 | 254,696 | 6,085 | (1,369,835)
Ending Balance (in shares) at Jun. 30, 2021 |  | 272,835 |  |  |  |
Net loss | (82,998) |  |  | (82,998) |  |
Foreign currency translation adjustment | (232) |  |  |  | (232) |
Vesting of restricted stock units |  | $ 1 | (1) |  |  |
Vesting of restricted stock units (in shares) |  | 51 |  |  |  |
Stock-based compensation | 5,048 |  | 5,048 |  |  |
Payment of cash dividends | (3,780) |  |  | (3,780) |  |
Dividend equivalents | (58) |  |  | (58) |  |
Purchase of treasury stock | (52) |  |  |  |  | (52)
Ending Balance at Sep. 30, 2021 | $ 1,725,645 | $ 2,729 | $ 2,919,090 | $ 167,860 | $ 5,853 | $ (1,369,887)
Ending Balance (in shares) at Sep. 30, 2021 | 272,885,704 | 272,886 |  |  |  |

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