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Consolidated Statements of Stockholders' Equity (Unaudited) Statement - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning balance, common stock, shares issued at Dec. 31, 2020 |  | 44,568 |  |  |  |
Beginning balance, net of taxes at Dec. 31, 2020 | $ 850,799 | $ 446 | $ (138,909) | $ 538,006 | $ (1,078) | $ 452,334
Beginning balance, treasury stock, shares at Dec. 31, 2020 |  |  | 5,367 |  |  |
Net income | 149,156 |  |  |  |  | 149,156
Other comprehensive income (loss) | (4) |  |  |  | (4) |
Common stock issued, shares |  | 130 |  |  |  |
Common stock issued, value | 1 | $ 1 |  |  |  |
Stock-based compensation | 2,092 |  |  | 2,092 |  |
Common stock dividends | $ (4,116) |  |  |  |  | (4,116)
Dividends declared per common share | $ 0.10 |  |  |  |  |
Tax withholding payments on stock-based awards | $ (2,729) |  |  | (2,729) |  |
Proceeds from exercise of stock options | 63 |  |  | 63 |  |
Other | (1) |  |  | (1) |  |
Ending balance, common stock, shares issued at Mar. 31, 2021 |  | 44,698 |  |  |  |
Ending balance, net of taxes at Mar. 31, 2021 | 995,261 | $ 447 | $ (138,909) | 537,431 | (1,082) | 597,374
Ending balance, treasury stock, shares at Mar. 31, 2021 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Dec. 31, 2020 |  | 44,568 |  |  |  |
Beginning balance, net of taxes at Dec. 31, 2020 | 850,799 | $ 446 | $ (138,909) | 538,006 | (1,078) | 452,334
Beginning balance, treasury stock, shares at Dec. 31, 2020 |  |  | 5,367 |  |  |
Net income | 543,411 |  |  |  |  |
Other comprehensive income (loss) | $ (10) |  |  |  |  |
Dividends declared per common share | $ 2.30 |  |  |  |  |
Ending balance, common stock, shares issued at Sep. 30, 2021 |  | 44,698 |  |  |  |
Ending balance, net of taxes at Sep. 30, 2021 | $ 1,305,605 | $ 447 | $ (138,909) | 541,022 | (1,088) | 904,133
Ending balance, treasury stock, shares at Sep. 30, 2021 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Mar. 31, 2021 |  | 44,698 |  |  |  |
Beginning balance, net of taxes at Mar. 31, 2021 | 995,261 | $ 447 | $ (138,909) | 537,431 | (1,082) | 597,374
Beginning balance, treasury stock, shares at Mar. 31, 2021 |  |  | 5,367 |  |  |
Net income | 302,556 |  |  |  |  | 302,556
Other comprehensive income (loss) | (3) |  |  |  | (3) |
Stock-based compensation | 1,411 |  |  | 1,411 |  |
Common stock dividends | $ (83,514) |  |  |  |  | (83,514)
Dividends declared per common share | $ 2.10 |  |  |  |  |
Other | $ (1) |  |  | (1) |  |
Ending balance, common stock, shares issued at Jun. 30, 2021 |  | 44,698 |  |  |  |
Ending balance, net of taxes at Jun. 30, 2021 | 1,215,710 | $ 447 | $ (138,909) | 538,841 | (1,085) | 816,416
Ending balance, treasury stock, shares at Jun. 30, 2021 |  |  | 5,367 |  |  |
Net income | 91,699 |  |  |  |  | 91,699
Other comprehensive income (loss) | (3) |  |  |  | (3) |
Stock-based compensation | 2,181 |  |  | 2,181 |  |
Common stock dividends | $ (3,982) |  |  |  |  | (3,982)
Dividends declared per common share | $ 0.10 |  |  |  |  |
Ending balance, common stock, shares issued at Sep. 30, 2021 |  | 44,698 |  |  |  |
Ending balance, net of taxes at Sep. 30, 2021 | $ 1,305,605 | $ 447 | $ (138,909) | 541,022 | (1,088) | 904,133
Ending balance, treasury stock, shares at Sep. 30, 2021 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Dec. 31, 2021 | 44,698 | 44,698 |  |  |  |
Beginning balance, net of taxes at Dec. 31, 2021 | $ 1,352,619 | $ 447 | $ (138,909) | 543,249 | (1,047) | 948,879
Beginning balance, treasury stock, shares at Dec. 31, 2021 | 5,367 |  | 5,367 |  |  |
Net income | $ 302,600 |  |  |  |  | 302,600
Other comprehensive income (loss) | 114 |  |  |  | 114 |
Common stock issued, shares |  | 117 |  |  |  |
Common stock issued, value | 1 | $ 1 |  |  |  |
Stock-based compensation | 2,392 |  |  | 2,392 |  |
Common stock dividends | $ (5,133) |  |  |  |  | (5,133)
Dividends declared per common share | $ 0.12 |  |  |  |  |
Tax withholding payments on stock-based awards | $ (3,930) |  |  | (3,930) |  |
Proceeds from exercise of stock options | 27 |  |  | 27 |  |
Other | (1) |  |  | (1) |  |
Ending balance, common stock, shares issued at Mar. 31, 2022 |  | 44,815 |  |  |  |
Ending balance, net of taxes at Mar. 31, 2022 | $ 1,648,689 | $ 448 | $ (138,909) | 541,737 | (933) | 1,246,346
Ending balance, treasury stock, shares at Mar. 31, 2022 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Dec. 31, 2021 | 44,698 | 44,698 |  |  |  |
Beginning balance, net of taxes at Dec. 31, 2021 | $ 1,352,619 | $ 447 | $ (138,909) | 543,249 | (1,047) | 948,879
Beginning balance, treasury stock, shares at Dec. 31, 2021 | 5,367 |  | 5,367 |  |  |
Net income | $ 740,298 |  |  |  |  |
Other comprehensive income (loss) | $ 145 |  |  |  |  |
Dividends declared per common share | $ 2.86 |  |  |  |  |
Ending balance, common stock, shares issued at Sep. 30, 2022 | 44,815 | 44,815 |  |  |  |
Ending balance, net of taxes at Sep. 30, 2022 | $ 1,983,072 | $ 448 | $ (138,909) | 548,035 | (902) | 1,574,400
Ending balance, treasury stock, shares at Sep. 30, 2022 | 5,367 |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Mar. 31, 2022 |  | 44,815 |  |  |  |
Beginning balance, net of taxes at Mar. 31, 2022 | $ 1,648,689 | $ 448 | $ (138,909) | 541,737 | (933) | 1,246,346
Beginning balance, treasury stock, shares at Mar. 31, 2022 |  |  | 5,367 |  |  |
Net income | 218,111 |  |  |  |  | 218,111
Other comprehensive income (loss) | 16 |  |  |  | 16 |
Stock-based compensation | 3,011 |  |  | 3,011 |  |
Common stock dividends | $ (104,842) |  |  |  |  | (104,842)
Dividends declared per common share | $ 2.62 |  |  |  |  |
Ending balance, common stock, shares issued at Jun. 30, 2022 |  | 44,815 |  |  |  |
Ending balance, net of taxes at Jun. 30, 2022 | $ 1,764,985 | $ 448 | $ (138,909) | 544,748 | (917) | 1,359,615
Ending balance, treasury stock, shares at Jun. 30, 2022 |  |  | 5,367 |  |  |
Net income | 219,587 |  |  |  |  | 219,587
Other comprehensive income (loss) | 15 |  |  |  | 15 |
Stock-based compensation | 3,287 |  |  | 3,287 |  |
Common stock dividends | $ (4,802) |  |  |  |  | (4,802)
Dividends declared per common share | $ 0.12 |  |  |  |  |
Ending balance, common stock, shares issued at Sep. 30, 2022 | 44,815 | 44,815 |  |  |  |
Ending balance, net of taxes at Sep. 30, 2022 | $ 1,983,072 | $ 448 | $ (138,909) | $ 548,035 | $ (902) | $ 1,574,400
Ending balance, treasury stock, shares at Sep. 30, 2022 | 5,367 |  | 5,367 |  |  |

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