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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, 2019 |  | 44,353 |  |  |  |
Beginning balance, net of taxes at Dec. 31, 2019 | $ 701,330 | $ 444 | $ (138,909) | $ 533,345 | $ (50,248) | $ 356,698
Beginning balance, treasury stock, shares at Dec. 31, 2019 |  |  | 5,367 |  |  |
Net income | 12,200 |  |  |  |  | 12,200
Other comprehensive income (loss) | 215 |  |  |  | 215 |
Common stock issued, shares |  | 211 |  |  |  |
Common stock issued, value | 2 | $ 2 |  |  |  |
Stock-based compensation | 1,674 |  |  | 1,674 |  |
Common stock dividends | $ (3,866) |  |  |  |  | (3,866)
Dividends declared per common share | $ 0.10 |  |  |  |  |
Tax withholding payments on stock-based awards | $ (3,309) |  |  | (3,309) |  |
Proceeds from exercise of stock options | 27 |  |  | 27 |  |
Other | (2) |  |  | (2) |  |
Ending balance, common stock, shares issued at Mar. 31, 2020 |  | 44,564 |  |  |  |
Ending balance, net of taxes at Mar. 31, 2020 | 708,271 | $ 446 | $ (138,909) | 531,735 | (50,033) | 365,032
Ending balance, treasury stock, shares at Mar. 31, 2020 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Dec. 31, 2019 |  | 44,353 |  |  |  |
Beginning balance, net of taxes at Dec. 31, 2019 | 701,330 | $ 444 | $ (138,909) | 533,345 | (50,248) | 356,698
Beginning balance, treasury stock, shares at Dec. 31, 2019 |  |  | 5,367 |  |  |
Net income | 148,978 |  |  |  |  |
Other comprehensive income (loss) | $ 516 |  |  |  |  |
Dividends declared per common share | $ 1.90 |  |  |  |  |
Ending balance, common stock, shares issued at Sep. 30, 2020 |  | 44,568 |  |  |  |
Ending balance, net of taxes at Sep. 30, 2020 | $ 778,136 | $ 446 | $ (138,909) | 536,025 | (49,732) | 430,306
Ending balance, treasury stock, shares at Sep. 30, 2020 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Mar. 31, 2020 |  | 44,564 |  |  |  |
Beginning balance, net of taxes at Mar. 31, 2020 | 708,271 | $ 446 | $ (138,909) | 531,735 | (50,033) | 365,032
Beginning balance, treasury stock, shares at Mar. 31, 2020 |  |  | 5,367 |  |  |
Net income | 33,586 |  |  |  |  | 33,586
Other comprehensive income (loss) | 150 |  |  |  | 150 |
Stock-based compensation | 1,671 |  |  | 1,671 |  |
Common stock dividends | $ (3,970) |  |  |  |  | (3,970)
Dividends declared per common share | $ 0.10 |  |  |  |  |
Ending balance, common stock, shares issued at Jun. 30, 2020 |  | 44,564 |  |  |  |
Ending balance, net of taxes at Jun. 30, 2020 | $ 739,708 | $ 446 | $ (138,909) | 533,406 | (49,883) | 394,648
Ending balance, treasury stock, shares at Jun. 30, 2020 |  |  | 5,367 |  |  |
Net income | 103,192 |  |  |  |  | 103,192
Other comprehensive income (loss) | 151 |  |  |  | 151 |
Common stock issued, shares |  | 4 |  |  |  |
Common stock issued, value | 0 | $ 0 |  |  |  |
Stock-based compensation | 2,494 |  |  | 2,494 |  |
Common stock dividends | $ (67,534) |  |  |  |  | (67,534)
Dividends declared per common share | $ 1.70 |  |  |  |  |
Proceeds from exercise of stock options | $ 125 |  |  | 125 |  |
Ending balance, common stock, shares issued at Sep. 30, 2020 |  | 44,568 |  |  |  |
Ending balance, net of taxes at Sep. 30, 2020 | $ 778,136 | $ 446 | $ (138,909) | 536,025 | (49,732) | 430,306
Ending balance, treasury stock, shares at Sep. 30, 2020 |  |  | 5,367 |  |  |
Beginning balance, common stock, shares issued at Dec. 31, 2020 | 44,568 | 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 |  | 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 | 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 |  | 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 | 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 |  | 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 | 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 |  | 5,367 |  |  |

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