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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Retained Earnings Cumulative Effect of Adoption Adjustment | Retained Earnings | Cumulative Effect of Adoption Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (ASU 2016-13) at Dec. 31, 2019 |  |  |  |  | $ (3,832) |  | $ (3,832) |
Beginning Balance at Dec. 31, 2019 | $ 531 | $ (169,365) | $ 270,923 |  |  | $ 1,341,344 |  | $ 1,443,433
Beginning Balance, shares at Dec. 31, 2019 | 53,054 | 4,949 |  |  |  |  |  |
Comprehensive income |  |  |  |  |  | 71,385 |  | 71,385
Common stock purchased for treasury |  | $ (60,737) |  |  |  |  |  | (60,737)
Common stock acquired, shares |  | 787 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 10 |  |  |  |  |  |
Share-based compensation | $ 1 | $ (4,969) | 2,655 |  |  |  |  | (2,313)
Share-based compensation, shares | 164 | 62 |  |  |  |  |  |
Exercise of stock options |  |  | 72 |  |  |  |  | 72
Exercise of stock options, shares | 3 |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2020 | $ 532 | $ (235,071) | 273,650 |  |  | 1,408,897 |  | 1,448,008
Ending Balance, shares at Mar. 31, 2020 | 53,221 | 5,808 |  |  |  |  |  |
Comprehensive income |  |  |  |  |  | 47,010 |  | 47,010
Common stock purchased for treasury |  | $ (8,311) |  |  |  |  |  | (8,311)
Common stock acquired, shares |  | 111 |  |  |  |  |  |
Share-based compensation |  |  | 2,678 |  |  |  |  | 2,678
Share-based compensation, shares | 3 |  |  |  |  |  |  |
Exercise of stock options |  |  | 2 |  |  |  |  | 2
Exercise of stock options, shares | 1 |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2020 | $ 532 | $ (243,382) | 276,330 |  |  | 1,455,907 |  | 1,489,387
Ending Balance, shares at Jun. 30, 2020 | 53,225 | 5,919 |  |  |  |  |  |
Comprehensive income |  |  |  |  |  | 52,046 |  | 52,046
Common stock purchased for treasury |  | $ (23,267) |  |  |  |  |  | (23,267)
Common stock acquired, shares |  | 266 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 1 |  |  |  |  |  |
Share-based compensation |  |  | 2,713 |  |  |  |  | 2,713
Exercise of stock options |  |  | 104 |  |  |  |  | 104
Exercise of stock options, shares | 6 |  |  |  |  |  |  |
Ending Balance (ASU 2016-13) at Sep. 30, 2020 |  |  |  |  |  |  | $ (3,832) |
Ending Balance at Sep. 30, 2020 | $ 532 | $ (266,649) | 279,147 |  |  | 1,507,953 |  | 1,520,983
Ending Balance, shares at Sep. 30, 2020 | 53,231 | 6,186 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ 533 | $ (303,379) | 282,467 |  |  | 1,594,708 |  | 1,574,329
Beginning Balance, shares at Dec. 31, 2020 | 53,277 | 6,628 |  |  |  |  |  |
Comprehensive income |  |  |  | $ (120) |  | 78,112 |  | 77,992
Common stock purchased for treasury |  | $ (56,348) | (7,000) |  |  |  |  | (63,348)
Common stock acquired, shares |  | 567 |  |  |  |  |  |
Share-based compensation | $ 1 | $ (5,994) | 3,018 |  |  |  |  | (2,975)
Share-based compensation, shares | 180 | 56 |  |  |  |  |  |
Exercise of stock options | $ 2 |  | 2,678 |  |  |  |  | 2,680
Exercise of stock options, shares | 176 |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2021 | $ 536 | $ (365,721) | 281,163 | (120) |  | 1,672,820 |  | 1,588,678
Ending Balance, shares at Mar. 31, 2021 | 53,633 | 7,251 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | $ 533 | $ (303,379) | 282,467 |  |  | 1,594,708 |  | 1,574,329
Beginning Balance, shares at Dec. 31, 2020 | 53,277 | 6,628 |  |  |  |  |  |
Ending Balance at Sep. 30, 2021 | $ 536 | $ (663,558) | 293,859 |  |  | 1,769,939 |  | 1,400,776
Ending Balance, shares at Sep. 30, 2021 | 53,637 | 10,583 |  |  |  |  |  |
Beginning Balance at Mar. 31, 2021 | $ 536 | $ (365,721) | 281,163 | (120) |  | 1,672,820 |  | 1,588,678
Beginning Balance, shares at Mar. 31, 2021 | 53,633 | 7,251 |  |  |  |  |  |
Comprehensive income |  |  |  | (65) |  | 49,461 |  | 49,396
Common stock purchased for treasury |  | $ (95,331) | (3,000) |  |  |  |  | (98,331)
Common stock acquired, shares |  | 982 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 8 |  |  |  |  |  |
Share-based compensation |  |  | 2,940 |  |  |  |  | 2,940
Share-based compensation, shares | 4 |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2021 | $ 536 | $ (461,052) | 281,103 | (185) |  | 1,722,281 |  | 1,542,683
Ending Balance, shares at Jun. 30, 2021 | 53,637 | 8,241 |  |  |  |  |  |
Comprehensive income |  |  |  | $ 185 |  | 47,658 |  | 47,843
Common stock purchased for treasury |  | $ (202,506) | 10,000 |  |  |  |  | (192,506)
Common stock acquired, shares |  | 2,324 |  |  |  |  |  |
Restricted shares forfeited, shares |  | 18 |  |  |  |  |  |
Share-based compensation |  |  | 2,756 |  |  |  |  | 2,756
Ending Balance at Sep. 30, 2021 | $ 536 | $ (663,558) | $ 293,859 |  |  | $ 1,769,939 |  | $ 1,400,776
Ending Balance, shares at Sep. 30, 2021 | 53,637 | 10,583 |  |  |  |  |  |

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